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#1 |
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Senior Member
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Hello ladies... well theres some new idea's for my 13 second all motor LS project.
as many of u know im working on making my 1992 B18a CRX into a 13 second all motor car on a low ass budget. i just got my 13 lb clutch in, and my act pressure plate and disc. and now im starting to work on the head.I have crower 403's with titanium springs and retainers ready to go in after i take the head to the shop. a new plan has come up, to raise the compression by milling the head. i have to get new vavle seals and guides, and 3 angle valve grind with a mild PnP, and i thought a nice head milling would raise compression to around 10-10.5:1. any1 see any problem with this? can the head get milled this much? im keeping stock Pistons and rod's for price sake. im also possible getting a JDM 4-1 header with a 2.5" collector for 350 canadian, and a real mugen ECU, with 3 chips for 300 canadian. just depends on my $$ situation. right now ive spent the follow which are ALL IN CANADIAN DOLLERS $400- 2.25" cat back exhaust with arospeed genII muffler( yes eww arospeed) $80 - short ram intake with K&N filter $5 - dryer tubing running from bumper to intake cone. $80 - lightened integra flywheel ( 13lbs) $650 - ACT clutch and pressure plate $1300 - crower 403 cams with titanium springs and retainers $150- Block Guard. In shop, is my head $400- new valve seals and guides, mild PnP, 3 angle valve grind, and MAYBE deck it to raise compression coming soon JDM 4-1 header Mugen ECU with 3 different chips Ill keep ya'll posted after i take her to the track also, my question was. how far can i mill the head to get max compression ( would like 10-10.5:1) Thanks __________________
Sleepers Are the Only way to Go. 1990 CRX Si B18a(92) CAI/E, Gutted, ACT clutch/pressure plate/13lb flywheel, Crower 403 Cams, Titanium Valve springs & Retainers, Blockguard, Head Milled 20 thou, 9.8:1 Compression, AEM cam gears. 1/4 = 14.73 60' = 2.48 trap = 95.03mph Soon to get: Header, Slicks Future 13 second all motor LS! |
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#2 |
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Senior Member
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ditch the "mugen" ECU. It's not from Mugen. Second of all, use pistons to raise your compression. I would reccomend b16 pistons. They aren't even that expensive, and you can save money by ---> Also, you have abosolutely no need for a block guard, all it has the potential to do is cause problems. Your valvetrain seems good to me, but im not an n/a guy, so someone else might be able to give more input on that.
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"Our enemies are innovative and resourceful, and so are we. They never stop thinking about new ways to harm our country and our people, and neither do we." -The thought provoking George W. Bush |
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#3 |
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Senior Member
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im thinking of going n2o later on down the road, thats y the block guard, and while the head is off i may as well do it. i also dont have the knowledge to lower the block to get b16 pistions ineither.
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Sleepers Are the Only way to Go. 1990 CRX Si B18a(92) CAI/E, Gutted, ACT clutch/pressure plate/13lb flywheel, Crower 403 Cams, Titanium Valve springs & Retainers, Blockguard, Head Milled 20 thou, 9.8:1 Compression, AEM cam gears. 1/4 = 14.73 60' = 2.48 trap = 95.03mph Soon to get: Header, Slicks Future 13 second all motor LS! |
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#4 |
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Super Moderator
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i agree with what liquidmeth said, and if you're thinking of spraying later, then get forged pistons, honda oem cast pistons are not a good choice for spray, really depends on how much you want to spray. but the blockguard will not help you with that, ditch the blockguard.
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2005 Mitsubishi Lancer Evolution 8 2004 BMW 325i 2000 Mercedes Benz ML 430 1994 Honda Civic Del Sol VTEC (race kaa) |
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#5 |
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Senior Member
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im only wanting a 35-50 shot, nothing higher than 55. but that is after i hit 13's N/A then i try to spray for 12's or low 13's.
and eventho i dont NEED blockguard i think it would just be safer and more friendly on me later if i did it now. i didnt think u had any problems with them. __________________
Sleepers Are the Only way to Go. 1990 CRX Si B18a(92) CAI/E, Gutted, ACT clutch/pressure plate/13lb flywheel, Crower 403 Cams, Titanium Valve springs & Retainers, Blockguard, Head Milled 20 thou, 9.8:1 Compression, AEM cam gears. 1/4 = 14.73 60' = 2.48 trap = 95.03mph Soon to get: Header, Slicks Future 13 second all motor LS! |
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#6 |
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88 C1V1C 53D4N DR1V3R
Join Date: Dec 2002
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if your that stuck on it just have a machine shop "post" your cylinder walls.
posting>blockguards. are you doing a complete rebuild with new piston rings? cause if you are just get a set of b16 pistons, they fit the stock ls rods and will give you a very nice 10.8:1 compression. that setup should easily get you into the low 13's on a cool day at sea level. |
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#7 |
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Senior Member
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no, im just redoing the head, i dont wanna get into the block cause i dont have the $$ or the skill yet. so i wanna do what i can with raising compression on the head, so milling seemed the best option.
also Blockguards are alot cheaper than posting. __________________
Sleepers Are the Only way to Go. 1990 CRX Si B18a(92) CAI/E, Gutted, ACT clutch/pressure plate/13lb flywheel, Crower 403 Cams, Titanium Valve springs & Retainers, Blockguard, Head Milled 20 thou, 9.8:1 Compression, AEM cam gears. 1/4 = 14.73 60' = 2.48 trap = 95.03mph Soon to get: Header, Slicks Future 13 second all motor LS! |
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#8 |
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Senior Member
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seems i can mill it 20 thousands giving me 9.8:1 compression maybe 10.0:1, which is good enough for what ill be doing with it.
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Sleepers Are the Only way to Go. 1990 CRX Si B18a(92) CAI/E, Gutted, ACT clutch/pressure plate/13lb flywheel, Crower 403 Cams, Titanium Valve springs & Retainers, Blockguard, Head Milled 20 thou, 9.8:1 Compression, AEM cam gears. 1/4 = 14.73 60' = 2.48 trap = 95.03mph Soon to get: Header, Slicks Future 13 second all motor LS! |
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#9 |
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Super Moderator
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eh, i still say throw the b16 pistons in there, do it right the first time
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2005 Mitsubishi Lancer Evolution 8 2004 BMW 325i 2000 Mercedes Benz ML 430 1994 Honda Civic Del Sol VTEC (race kaa) |
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#10 |
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Admin with a big stick
Join Date: Sep 2002
Location: Dallas / Fort Worth, TX
Age: 32
Posts: 24,525
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Ride: 2003 S2000
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I did the math on the shoddy little B series compression calculator- milling will only raise you about 0.2:1 per ten thousandths of an inch. That's it. If you want to go from your stock 9.2:1 to 9.8:1, you would have to mill 0.030 inches off, and that's quite a bit of material. Going to 10.5:1 would require 0.065 inches...
Even if the math is off, milling to raise compression really isn't how you should approach the problem. I'm sure you can find a set of B16 pistons for pretty cheap and drop those in on top of your stock rods. It's not too too difficult. __________________
DO NOT PM me with tech questions! Use the forums! Intercrew Auto Salon - (972) 485-8688 |
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#11 |
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GNU/Linux Evangelist
Join Date: Sep 2002
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PIstons are the way to go. I have a set of JDM B16 Pistons on LS rods I would sell you for a reasonable price. The JDM pistons yield a slightly high compression ratio than the USDM.
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v3sw7+9Chw6ln3pr7Ock4ma9w3TXm3l7GDF i7Ce6+8t4MNb8Oen6g6RAOa26s5MRp6 hackerkey.com |
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#12 |
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Senior Member
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hmm, i have a friend who has been racing and building honda's since he was 10, and he is building an LS b/c he is bored of everything else ( has build a b18c1 b16a and h22a) and he went with Je pistions then milled the head the same amount i want to do mine, and his comp went from 10.6:1-10.8:1, so i should get .2 more compression.
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Sleepers Are the Only way to Go. 1990 CRX Si B18a(92) CAI/E, Gutted, ACT clutch/pressure plate/13lb flywheel, Crower 403 Cams, Titanium Valve springs & Retainers, Blockguard, Head Milled 20 thou, 9.8:1 Compression, AEM cam gears. 1/4 = 14.73 60' = 2.48 trap = 95.03mph Soon to get: Header, Slicks Future 13 second all motor LS! |
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#13 |
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Admin with a big stick
Join Date: Sep 2002
Location: Dallas / Fort Worth, TX
Age: 32
Posts: 24,525
iTrader: 0 / 0%
Ride: 2003 S2000
Rep Power: 291
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There you go- and he still used custom pistons. He should have just spec'd out the pistons to be 10.8:1 instead of milling to gain extra compression. Go buy yourself the B16 pistons.
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DO NOT PM me with tech questions! Use the forums! Intercrew Auto Salon - (972) 485-8688 |
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#14 | |
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Senior Member
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Quote:
__________________
Latest project - 1 fucking fast 99 SI
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#15 |
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Senior Member
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yup, milling shouldn't be suggested to raise compression. Get forged pistons for the ride.
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<span style=\"color:red\">"92 Blue EG"</span> -Project 3 - Motor A (NA stock SiR longblock B16 EG/S1tran) 14.3@97 15" radial tires & Gutted -Project 3 - Motor B (NA stock SiRII longblock B16 EG/S4tran) 13.3@103 MT's & Gutted <span style=\"color:red\">"Goldy S13"</span> -Project 4 - Motor A (FI SR20DET w/T28 "Under Construction" <span style=\"color:red\">"Silver E46"</span> -Project 5 - Motor A (???) |
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#16 |
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Senior Member
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a block guard has a greater chance of distorting your block than it does saving your motor. You have to know that blockguards aren't a harmless addition to saftey. They have the potential to cause pretty serious problems.
__________________
"Our enemies are innovative and resourceful, and so are we. They never stop thinking about new ways to harm our country and our people, and neither do we." -The thought provoking George W. Bush |
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#17 |
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Admin with a big stick
Join Date: Sep 2002
Location: Dallas / Fort Worth, TX
Age: 32
Posts: 24,525
iTrader: 0 / 0%
Ride: 2003 S2000
Rep Power: 291
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Not if you weld them in and then rebore your sleeves so they're shaped correctly, but yeah- block guards aren't the best solution.
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DO NOT PM me with tech questions! Use the forums! Intercrew Auto Salon - (972) 485-8688 |
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#18 |
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Senior Member
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ya well i took my head in today, 270 bucks canadian to get it ALL Done, valve seals guides, 3 angle valve grind, 20 thou mill, install crower springs and retainers. i am going to say no to the blockguard too, cause it will take another week to get here and i wanna get my car on the road asap. i hate borrowing my sisters 93 tercel
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Sleepers Are the Only way to Go. 1990 CRX Si B18a(92) CAI/E, Gutted, ACT clutch/pressure plate/13lb flywheel, Crower 403 Cams, Titanium Valve springs & Retainers, Blockguard, Head Milled 20 thou, 9.8:1 Compression, AEM cam gears. 1/4 = 14.73 60' = 2.48 trap = 95.03mph Soon to get: Header, Slicks Future 13 second all motor LS! |
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#19 |
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Senior Member
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If you plan on reving higher than 6.8K with your 403's than I would suggest maybe getting your rods Shotpened and resized. ( $150 US ) I think LS rods are really being pushed around 8k! And while they are at the machine shop get the B16 pistons pressed on. I would wait a week or so now, so you have no reason to tear it back down later..........Do it right the first time. Good Luck!
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<span style=\'color:red\'>14.2:1 CR LS with 405A's and working out the bugs</span> <u>Fastest 60ft</u> 1.78 <u>Best ET on 1/8th</u> 8.42 <u>Fastest MPH</u> 82.23 mph All Motor LS (B18B) <span style=\'color:green\'>Hasn't been tuned yet!</span> |
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#20 |
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Senior Member
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LS rods are good to about 7500 rpm, after that its iffy, and i will only take it about 7300 right now, until i can get a new ECU. after that i might take them a bit higher like 7400, but probably still well below 8000
__________________
Sleepers Are the Only way to Go. 1990 CRX Si B18a(92) CAI/E, Gutted, ACT clutch/pressure plate/13lb flywheel, Crower 403 Cams, Titanium Valve springs & Retainers, Blockguard, Head Milled 20 thou, 9.8:1 Compression, AEM cam gears. 1/4 = 14.73 60' = 2.48 trap = 95.03mph Soon to get: Header, Slicks Future 13 second all motor LS! |
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#21 | |
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Senior Member
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Quote:
__________________
Latest project - 1 fucking fast 99 SI
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#22 |
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Senior Member
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YEP, rev limiter is 7k and cams cut out about 6.8k i think. That is why I brought it up. To use the full pot. of the cams.
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<span style=\'color:red\'>14.2:1 CR LS with 405A's and working out the bugs</span> <u>Fastest 60ft</u> 1.78 <u>Best ET on 1/8th</u> 8.42 <u>Fastest MPH</u> 82.23 mph All Motor LS (B18B) <span style=\'color:green\'>Hasn't been tuned yet!</span> |
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#23 |
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Senior Member
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what crack have u been smoking, the rev limiter isnt 7000. i take it up to 7200 all the time, and that was on stock cams. my new cams will be to 7500. and they dont have PEAK at 7300 RPM, thats where its high and good on stock bottem end. with springs and retainers and ecu u can safly take it to 7500 after that its hell for the bottem end. also, stock b18a/b's redline at 6500^^ gotta love taking it 800 RPM past redline on stock engine
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Sleepers Are the Only way to Go. 1990 CRX Si B18a(92) CAI/E, Gutted, ACT clutch/pressure plate/13lb flywheel, Crower 403 Cams, Titanium Valve springs & Retainers, Blockguard, Head Milled 20 thou, 9.8:1 Compression, AEM cam gears. 1/4 = 14.73 60' = 2.48 trap = 95.03mph Soon to get: Header, Slicks Future 13 second all motor LS! |
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#24 |
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Senior Member
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Not to start an argument, but B18As and B18Bs have different redlines if I'm not mistaken. The A might be 6500 but I'm ALMOST sure the B18b goes to 7000.
P.S. - Why the fuck did you get valvesprings and retainers if you already rev to 7300 and don't plan on taking it past 7400? ![]() __________________
Latest project - 1 fucking fast 99 SI
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#25 |
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GNU/Linux Evangelist
Join Date: Sep 2002
Location: Greater Portland, OR
Posts: 5,497
iTrader: 0 / 0%
Ride: The Cheapest Road Bicycle I could get
Rep Power: 69
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The 93 B18A redline is 6800, fuel cut is 7200.
__________________
v3sw7+9Chw6ln3pr7Ock4ma9w3TXm3l7GDF i7Ce6+8t4MNb8Oen6g6RAOa26s5MRp6 hackerkey.com |
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