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250r style intake conversion for stock cylinders.


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Cam, e-mail is sent. It is just a few I had the guy dig up real quick.

 

Yamahaman244, mobile photobucket? Holy shit good to know. Bout to check that out asap. That would sure save alot of aggravation.

 

By the way, the guy who does the intake work does have a shop. It is called Spec II Racing.

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First off, I really don't want to come off sounding like I'm attacking a new idea, because new theories and ideas are the only way we can progress in any aspect or area of knowledge and excellence. But, is there really a gain to be had by using the large 250r intakes on a stock cylinder? It sounds like you'll be doing extensive work to the transfers and exhaust, but will it all move enough air that a well ported stock intake (even with boost ports) restrict it? Maybe I'm just closed minded in thinking that welding a 24" culvert pipe onto a 1.5L civic is somehow going to gain power... but maybe you're just going for originality? Anyways, it looks like a sweet project to take on! I enjoy puzzles... especially when I make the pieces.

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gotta_gofast is right.....there are instructions in all wiseco boxes that will tell you the size of hte hole to drill and also exactly where to drill the holes for the exhaust bridge. The holes if i remember correctly are 1/16" in diameter. They go BELOW the rings so they actually allow the fuel/oil mix to weep through the holes and lube the exhaust bridge/and piston. Gotta remember.....its an exhaust bridge....so its screamin hot cause its actually got the fire from the cylinder breathing right past it.

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First off, I really don't want to come off sounding like I'm attacking a new idea, because new theories and ideas are the only way we can progress in any aspect or area of knowledge and excellence. But, is there really a gain to be had by using the large 250r intakes on a stock cylinder? It sounds like you'll be doing extensive work to the transfers and exhaust, but will it all move enough air that a well ported stock intake (even with boost ports) restrict it? Maybe I'm just closed minded in thinking that welding a 24" culvert pipe onto a 1.5L civic is somehow going to gain power... but maybe you're just going for originality? Anyways, it looks like a sweet project to take on! I enjoy puzzles... especially when I make the pieces.

Well, the theory will definitely be tested either way.. Due to the new sleeve being a nikasil sleeve, it will be thinner and problably be in the 68-70mm area and with a 4 mil crank it will be a decent sized motor. Plus the exhaust on the original viper sleeves before had the potential to out flow the intake on full drag port, but it did seem as if there was more left in it if the transfers were addressed before actually inserting the sleeve. No worries though GoFast, I definitely know what you meant. Just trying to develop a way to flow as much as a full ported drag cylinder, yet still have enough velocity to develop big torque. Not to mention the price for me is pretty acceptable. Only thing I gotta pay for is pistons, intake work, wich isn't much more then a good port job, and possibly some domes.

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Well, the theory will definitely be tested either way.. Due to the new sleeve being a nikasil sleeve, it will be thinner and problably be in the 68-70mm area and with a 4 mil crank it will be a decent sized motor. Plus the exhaust on the original viper sleeves before had the potential to out flow the intake on full drag port, but it did seem as if there was more left in it if the transfers were addressed before actually inserting the sleeve. No worries though GoFast, I definitely know what you meant. Just trying to develop a way to flow as much as a full ported drag cylinder, yet still have enough velocity to develop big torque. Not to mention the price for me is pretty acceptable. Only thing I gotta pay for is pistons, intake work, wich isn't much more then a good port job, and possibly some domes.

 

 

You definately need to post up progress and pics/dyno stuff. It'll be interesting to see this. With a 58mm stroke and big intakes you should be able to get that to spin REAL fast. Its unfortunate when some people post up a new idea that requires a lot of R&D and then quit on it or the thread sort of fades into the background. But it seems like you and your crew have most of the hard stuff figured out. PS, if its not top secret I'd like to see what you guys do to the tranfers while the sleeve is out! Not that I'll ever port a stock cylinder to that extent-lol-but I'm just interested in what/how you guys go about it.

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