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    ls vtec rs ratio really an issue?

    CAFROG is correct, as long as the bottom end is balanced and built right it's fine, more likely to break something in the valvetrain. My concern is I just don't see much data on longterm wear and reliability of this build, but I'm not an expert. You see the odd LS-VTEC blown up now and again on...
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    ls vtec rs ratio really an issue?

    I'm a big believer in R/S ratio. That said, it will not be the direct cause of your engine blowing up. Most important are your rods and rod bolts, as these are loaded to the extreme with the high piston speed, which is directly related to R/S, higher R/S will lower the Vmax, but bulletproof...
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    Engine hurt! Need help please!

    Look to see if the part numbers for the head gasket are the same, if so you're probably in business. If not there are oil passage differences b/t vtec and non-vtec for the b-series engines. Don't know about the D series, make sure the head will still get oil, if it won't you need to plumb it in...
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    EG help

    GSR swap will fit your needs. LS VTEC is a neat idea, but needs to be done right. The GSR/ITR B18s already put a lot of stress on the motor at high revs due to r/s ratio, LS VTEC is even worse with longer stroke, shorter rods. I'm partial to the B16b for it's design and craftsmanship, but it's...
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    Hytech?

    I'm ordering one for my swap, my understanding is it's a bit longer, and has a 2.5" collector. A stock cat will not fit, people seem to either run a test pipe to span the gap b/t the collector and the exhaust, this will have the 2 bolt flange on the header side, and the 3 bolt plate on the...
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    Engine hurt! Need help please!

    I hear you on being wary of buying someone else's dog of a motor, people suck. However if comp. is good and more importantly consistent it's likely OK, and you should be able to got one these for $200 I'd think. How much of the work can you do yourself on the head and block. If you can actually...
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    Engine hurt! Need help please!

    I think a swap is your best option... If you can pull your own head you can swap your motor. I only know OBDII issues and am ignorant about automatic trans., that said things to be aware of (research it on here). -Sensor plug/harness differences b/t years and OBDs, you can probably work around...
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    Engine hurt! Need help please!

    Impressive pic. You need to rebuild the head, valve job. They likely failed due to carbon build up on the seats from oil burning, carbon prevents heat transfer from the valve to the head and they burn up. If you can fully dissassembly and reassemble the head yourself the valve recut shouldn't be...
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    Engine hurt! Need help please!

    If the plug isn't firing it sounds like a distributor issue, not an engine issue. The smoke could be the unburnt mixture breaking down in the exhaust. Get that plug firing and then see where you're at. Check the resistance on the plug wire to see if it's failed, then check the distributor...
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    Best choice for 00' Civic Si engine swap(replacement)

    The primary limiter is the strength of the rotating/reciprocating assemblies, valve, springs, rods, etc. these all result in catastrophic failure. Average piston velocity is a function of the stroke, the linear distance it must travel in a revolution. However the max piston speed achieved and...
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    Best choice for 00' Civic Si engine swap(replacement)

    Got it. Those are the limits imposed by the stock ECU's (honda) from the factory, not the physical limit the motor is capable of. I was just gathering the information in one place to see the trend in R/S ratio and where Honda sets its ECU limiter. The F20C and B16b are both over 1.8 R/S and...
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    Best choice for 00' Civic Si engine swap(replacement)

    So I decided to derive the piston speed as a function of crank angle. The b16b and b16a are nearly identical, the b18c's are 12% faster at peak resulting in 25% more Kinetic Energy (KE). Most interesting is the load at max rod angle from horizontal. The b16a has 6% more than the b16b, and the...
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    Best choice for 00' Civic Si engine swap(replacement)

    My method wasn't too academically rigorous. I used google to find info on the engines and either got r/s directly or calculated it. I think the LS is like 1.54. With longer stroke the piston has to cover a larger linear distance in the same amount of time at a given rpm, so it has greater peak...
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    Best choice for 00' Civic Si engine swap(replacement)

    Here's some food for thought considering my original question about r/s and high reving, did some research on r/s of other honda high output engines... engine r/s ratio redline b16a 1.74 8200 b16b 1.84 8600 (can rev to 9000 before fuel cut) b18c1 1.58...
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    Best choice for 00' Civic Si engine swap(replacement)

    Thanks for all the help and advice. I ended up going with the b16b, I got a good deal on a 2000 in great shape. It was about the same as as a comparable GSR, and way cheaper than the ITR. Since it's the same model year and and disp as my car it makes the swap technically legal. I reside b/t MA...
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    2000 sir engine swap

    I've been researching my swap so I'll share what I've learned. Strictly speaking yes, everything will bolt up, don't think you even need to buy a mount. If you're putting the tranny in too you may need axles, not sure b/c I'm just swapping the long block, didn't check. You want to run the p73...
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    Best choice for 00' Civic Si engine swap(replacement)

    The long (primary runners) curl around in a semicircle, with the butterflies and secondary runners inside the semicircle. When they open up they provide a straight line shortcut to the primaries' more circuitous path. If that makes sense. If you google it there are diagrams. Yeah, I'll probably...
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    Best choice for 00' Civic Si engine swap(replacement)

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    Best choice for 00' Civic Si engine swap(replacement)

    Ha! Yes and no The CTR is basically (a couple minor diffs) a destroked ITR. Because of this at a given rpm the max piston velocity is lower and the R/S results in less side loading, and is more efficient in theory. There are two main failure modes for a high perf. engine like these. Failure of...
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    Best choice for 00' Civic Si engine swap(replacement)

    A little more info, clarification Thanks guys, I agree, with everything said so far. I was initially leaning GSR, it has better torque from 0-6k than even the ITR, which is where the engine spends most of its time, and the b16b is more money for less performance at the wheels. All the swaps are...
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