b17a vs b16a

[h1coupe]

what exactly is the difference of these two?
i have a b16 crank, head, ecu, sensors, rods and some other stuff can i use that all and just use the b17 block?
will that make the motor 1.7l or will i have to get the b17 crank to do that?
i read somewhere that the b17 block was the same as the b16!
if i put together a motor using b17 crank and block and everything else from a b16 would that be a b17 then?

 

[jotec]

the crank is what gives the b17 the added displacment. the blocks are the same.

 

[theb17guy]

Originally posted by h1coupe@Dec 17 2003, 07:13 PM
what exactly is the difference of these two?

if i put together a motor using b17 crank and block and everything else from a b16 would that be a b17 then?

aren't b17 rods longer? I think they are...somebody correct me?
the only two differences are compression ratio and stroke between the two motors.

 

[MaliWho97]

B17a Rod length, 5.208"
B16a Rod length, 5.290"

Info from Crower.com

 

[K2e2vin]

Originally posted by theb17guy+Dec 17 2003, 08:54 PM-->

h1coupe

@Dec 17 2003, 07:13 PM
what exactly is the difference of these two?

if i put together a motor using b17 crank and block and everything else from a b16 would that be a b17 then?

aren't b17 rods longer? I think they are...somebody correct me?
the only two differences are compression ratio and stroke between the two motors.

the b17 rods are shorter because it has the larger stroke(81.4mm i think vs. 77mm on b16)

 

[JDMilan]

as far are power gains, surprisingly the tq curves are almost identical, maybe a tad more in the 1.7

 

[allgo]

can the b17 crank just go straight in a b16 block with b16 rods ect.. will it work or will it be a disaster? will it be worth doing?

 

[SixtySecondAssassin]

you need b17 rods

 

[simplyfast]

b16 has a stroke of 77.4, while the b17 has a stroke of 81.4. the question you now need to ask is the stroke:rod length ratio for the b17 better than the b16's?

 

[SixtySecondAssassin]

since the stroke is longer in basically the same block, its pretty obvious that the rod/stroke ratio will be lower than that of the b16

 

[simplyfast]

exactly. the b17 also has the same deck height as the b16...hold on, i need to find a metric:imperial conversion chart.

b17a, 132.3mm; 5.208" rod length:stroke ratio is 1.625
b16a, 134.4mm; 5.290" rod length:stroke ratio is 1.736

so think about it. the b17 stroke will cause the piston to sit exactly 4mm higher in the cylinder than the b16 stroke, but the length of the b16 rods will recoup 2.1mm, so the final difference is the b17 setup will sit the piston 1.9mm higher in the cylinder.

 

[SixtySecondAssassin]

yea, lol.

 

[K2e2vin]

Originally posted by simplyfast@Dec 20 2003, 08:39 PM
exactly. the b17 also has the same deck height as the b16...hold on, i need to find a metric:imperial conversion chart.

b17a, 132.3mm; 5.208" rod length:stroke ratio is 1.625
b16a, 134.4mm; 5.290" rod length:stroke ratio is 1.736

so think about it. the b17 stroke will cause the piston to sit exactly 4mm higher in the cylinder than the b16 stroke, but the length of the b16 rods will recoup 2.1mm, so the final difference is the b17 setup will sit the piston 1.9mm higher in the cylinder.

you dont need to convert to find rod ratio. as long as they are both measure in same system(mm or inch, whatever it be) the answer will always be the same.

what?? the b17 and b16 should have piston-deck clearances are about the same.

 

[SixtySecondAssassin]

the wrist pin location on the pistons are probably different

 

[simplyfast]

what?? the b17 and b16 should have piston-deck clearances are about the same.

they should huh? i think sixty hit it on the head. but i dont know for sure cause im lookin thru all my piston catalogs and i cant locate a b17 piston or any data on it...but i gotta say, the je catalog with the girl droppin trouse...smokin, i want to buy her.

the b17 could also run a flat dome allowing it to sit higher in the cylinder while keeping its low 9.7:1 comp ratio down.

found this also. not a lot of data but the pictures speak volumes.

 

[K2e2vin]

frankenb.xls--xls file(excel spreadsheet). on last page shows rod, r/s ratio, stroke, etc. it turns out the b17 has a larger deck height; about .07mm taller.

 

[simplyfast]

the site i posted claims both deck heights are 263mm.

but .7mm would create a difference of 1.2mm.

 

[xj0hnx]

Originally posted by simplyfast@Dec 21 2003, 01:39 AM
exactly. the b17 also has the same deck height as the b16...hold on, i need to find a metric:imperial conversion chart.

b17a, 132.3mm; 5.208" rod length:stroke ratio is 1.625
b16a, 134.4mm; 5.290" rod length:stroke ratio is 1.736

so think about it. the b17 stroke will cause the piston to sit exactly 4mm higher in the cylinder than the b16 stroke, but the length of the b16 rods will recoup 2.1mm, so the final difference is the b17 setup will sit the piston 1.9mm higher in the cylinder.

B17A1 connecting rods are 137mm, 81.4mm stroke, 1.683 r/s
B16A2 connecting rods are 134mm, 77mm stroke, 1.740 r/s

 

[K2e2vin]

Originally posted by simplyfast@Dec 22 2003, 07:33 AM
the site i posted claims both deck heights are 263mm.

thats pretty tall, the b18/b20 blocks have deck heights of ~212mm. i think you have the number for block* height. the rod-stroke deck height(instead of height to deck its centerline of wrist pin, which is what the xls file uses) is 181.5mm for b18/b20 with the b16 at 172.5mm, b17 at 172.57mm.

 

[clomonolo]

Do they work because I'm in the same boat. Can b16 rods work with a b17 block/ crank