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post #1 of 4 Old 08-12-2009, 01:22 PM Thread Starter
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Building 750cc turbo honda motor got some questions

Alright motorcycle gurus time for yall to chime in here and give me a hand. Im in the process of building a tubro mini rail. Ive got a 750cc motor out of a hona cb750. I tired to do a 1000cc motor but it took a dump on me before I even had the turbo on. Well this cb750 motor only has 2000 miles on it and the guy layed it over and got rid of it. I have a KKK k26 turbo that is for a audi 1.8 liter engine. Its a small turbo and it will spool up really quick. It only has the potential to pump out 23 psi of boost at max rpm so I it will be good for my aplication (i think). Ive got my header already made and made all the tubes the same length so it will run even. What im wondering is what is a safe level of boost to run on a stock eninge? Ive got a wastegate and blow off valve in the mail so I can set it at what ever I want. I was thinking somewhere around 6-8 psi max. I dont know alot about motorcycle eninges or there carbs and this is where im going to run into a problem. Should I re jet the carbs? Also do you think running that amount of boost will kill the eninge to quick. I dont expect it to last 20,000 miles or anything like that but I was wondering if I should go ahead and have the motor rebuilt with some wiesco pistons and tougher internals or just wait till it goes? Thats enough questions for now. Thanks yall
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post #2 of 4 Old 08-12-2009, 03:22 PM Thread Starter
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bump! bump!
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post #3 of 4 Old 08-12-2009, 04:47 PM Thread Starter
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Anybody??????? Guess ill have to join a diff forum for this
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post #4 of 4 Old 08-12-2009, 04:57 PM
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i think thats a sweet project. i was gonna buy a turbo for my cbr 954 but backed out. well this guy knew a little bit about it. he said around 6 to 8 psi if your not running a intercooler. if you do run a ic than you can bump it to about 15 but thats on a 1000cc motor. i would say 8 to 12 would be good intercooled. as far as carbs, you would be better off finding some off a bigger cc bike. i think alot of people use the old kawasaki kz1000 carbs.
check out mrturbo.com, that might give you some helpful info. maybe you could call them too.
be sure to post progress pics. maybe ill do my bike

05 Single Cab Short Bed
*03 Turbo*Stroked Injectors*AFE Stage 2*Small mouth Intake*SCT With Eric's Extreme Race*4.30 Gear*Best ET 13.5@99MPH*
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