Question for peejay. RE: 190hp 12A
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Question for peejay. RE: 190hp 12A
I saw in one of your posts that you got 190hp out of a 12A using the stock manifold and a streetable exhast. What kind of set up did you use on that beast? That is exactly what I would like to do to my Autocross car. I am just starting my rebuild now and plan to port the motor, but I would kill to know how you did that using the stock manifold. It was my impresion that 150hp was the top you could get with the stock manifold. Thanks
#2
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I didn't. I was re-posting something that someone else posted to a mailing-list.
I personally wouldn't bother trying to make any power with a dead-stock manifold unless rules require it. As it comes from the factory, it's so bad that you can realize decent gains with even rudimentary work if you apply a little brainpower before breaking out the porting tools.
A properly ported stock manifold with a Nikki carb can actually make more power than a 48IDA with 38mm chokes. Chew on that one for a while
I personally wouldn't bother trying to make any power with a dead-stock manifold unless rules require it. As it comes from the factory, it's so bad that you can realize decent gains with even rudimentary work if you apply a little brainpower before breaking out the porting tools.
A properly ported stock manifold with a Nikki carb can actually make more power than a 48IDA with 38mm chokes. Chew on that one for a while
Last edited by peejay; 09-17-02 at 09:51 PM.
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Are there any links or sites that have info on porting the manifold as you sujested here. I have a manifold from a 79 and a 83 so I don't mind screwing one up in an atempt. Thanks
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Speaking of porting, how difficult is it to just disassemble the engine myself, and port it myself (tools, labor, knowledge, skills required, etc...)?
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adamp: http://personal.riverusers.com/~yawpower is a good place to start.
357: The engine really are fairly simple. If you've ever field-rebuilt a lawnmower engine, then the rotary will present no hassles. Invest in a manual (even a Haynes or (gack) a Chilton's will do) and study the engine disassembly/reassembly section so you know what you're up against.
357: The engine really are fairly simple. If you've ever field-rebuilt a lawnmower engine, then the rotary will present no hassles. Invest in a manual (even a Haynes or (gack) a Chilton's will do) and study the engine disassembly/reassembly section so you know what you're up against.
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Originally posted by 357
Speaking of porting, how difficult is it to just disassemble the engine myself, and port it myself (tools, labor, knowledge, skills required, etc...)?
Speaking of porting, how difficult is it to just disassemble the engine myself, and port it myself (tools, labor, knowledge, skills required, etc...)?
peejay: thanks for your help
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Hmmm, well, I have everything but the engine lift, but I might be able to use a small hydraulic crane from my dad's lab. Do i just need to run nylon straps around the engine to make sure it supported? also, with regards to the porting itself; what is the recommended method for removing the excess material, and what about dimensions of the port? Thanks again.
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#8
ACBron Motorsport
Originally posted by peejay
A properly ported stock manifold with a Nikki carb can actually make more power than a 48IDA with 38mm chokes. Chew on that one for a while
A properly ported stock manifold with a Nikki carb can actually make more power than a 48IDA with 38mm chokes. Chew on that one for a while
It is great!! Mine was made as a once off but the guy is now doing them for other guys, because there heaps cheaper than what a weber is over here.
it is a 12a nikki on a rx4 13b inlet manifold on a large extend ported 13b
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Originally posted by 357
Hmmm, well, I have everything but the engine lift, but I might be able to use a small hydraulic crane from my dad's lab. Do i just need to run nylon straps around the engine to make sure it supported?
Hmmm, well, I have everything but the engine lift, but I might be able to use a small hydraulic crane from my dad's lab. Do i just need to run nylon straps around the engine to make sure it supported?
Originally posted by 357
also, with regards to the porting itself; what is the recommended method for removing the excess material, and what about dimensions of the port? Thanks again.
also, with regards to the porting itself; what is the recommended method for removing the excess material, and what about dimensions of the port? Thanks again.
Jeff
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Atkins rotary has a real good video on rebuilding a 13b. It's only like 30 dollars. I bought it and it's very detailed. I'd recommend watching it a few times before trying to rebuild.
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