I have searched the internet for engine mods, but have found none.
Having done all the common mods - J costa - Powercommander - Leo Vince exhaust - Dr. pullley hit clutch - Malossi spring - and air box mods I want more. Has anyone ever played with their engine? I purchased a totaled wing to get the engine and disassembled to see what there was to work with. The cams went to Web Camshafts (very helpful people) in Ca. to be rewelded and reground. The stock pistons are a 72mm bore at 10-1 compression. Honda CBR954 pistons are 74mm bore with a 11.3-1 compresson and with luck the piston pin diameter and location are exactly the same. The cylinders were bored 2mm over, that is about as much as you can go as the cast in liners are fairly thin. Next, the crank was sent to Pttsburgh Crank in Pa. to be stroked a 1/4 inch. Now with the longer stroke the connecting rods had to be shortened 1/8 inch, so off to Powroll Performance in Or. they went. They are big in single cylinder dirt bike strokers and have been shortening rods for years, but were willing to shorten the wing rods. With these mods the engine displacement will go from 582cc to 670cc. Anyway, all the parts have been attained and the assembly has begone. The worst part of the job is swapping the engines as it almost entails tearing the wing down completely. I'll report the results when finished if there is any interest. I am hoping for a real sleeper.

Best of luck with your new engine. I just hope that the Power Commander
will be able to tweak the ECU so that all those mods not go to waste.

If you're successful you're really gonna annoy Mr. Spevack.

Care to share what those individual Shop Charges were for the cams, crank & bore work?

What are you going to do for an exhaust? Those pea shooter header pipes are sure restricting.

Tim

What might give you a couple more ponies is to polishing the intake and exhaust ports a bit to help flow.

To answer Cosmic_Jumper, I too am hoping the Power Commander will tweek the ECU. I even contacted them myself, because on most of their units they can unlock the rev limiter and access you another 500 rpm, but they said that ability is not built into the wing commander. I have a Leo Vince exhaust - I hope that does the job! I still want quiet. Web cams cost about $400, the crank $350, rod shortening $300, piston kits $150, and the bore jobs I did myself. I agree with DennisB, although the stock ports are pretty clean, some polishing would help. Nobody seems to want to tackle it? As you can see none of the mods come cheap, but it's my way of having fun!

Thanks dspevack! I never want to annoy anyone. Well, maybe not anyone. I read that article on turbo charging already, it was interesting. I have nitrous on my stock engine now (there are some pics in my alblum) that is a rush now. It won't engage unless the throttle is wide open and boy does the wing pull then! That is one of the reasons I am using 954 pistons as they are forged and can take the extra beating, hopefully, with the nitrous. I have small nitrous jets installed now because I am afraid of the stock cast pistons. Maye turbo next year? Just kidding!

Bob, Almost every scooter on this forum has a name. For the scooter your building may I sagest the name "THUMPER".

Good name, but it would have to be Thumper Jr. I put a 120 inch Harley engine in my buddy's dresser this year and he named it Thumper.

I think you should name it "Crotch Rocket".
Everyone will think you are joking, until they see you take off.

I hope you will dyno test the finished product and give us the results.
Dynojet centers will print the graph out for you and you can post it here.

Dan

I think a small turbo would give the best bang for the buck. From what I can see with the plumbing (intake and exhaust) on the right side and the addition of bigger injectors and a custom fuel management system (like the mega-squirt) you might be able to squeeze another 30hp out of the engine without any internal mods.

Jesse in Atlanta

Just looked at the site http://www.megasquirt.info/
Way to detailed for me. Did see that the microsquirt is for bikes.
Sounds like it does the same thing as a PC...Change Fuel/Air Mixture

bobhrc1:
How many times have you hit the nitrous?

Did you do any nitrous testing?
0-60 time?
Top Speed (actual not indicated)?
Quarter Mile?

The "squirts" are much more customizable than the power commander, which just fools the ECU into providing more fuel across the power band.

Jesse

I think you should call it SOBitchen

Dan, I never did any top end runs with nitrous. We have our unofficial drag strip near the shop here which is just a hair over 2 tenths of a mile at a slight upgrade hill. Without nitrous from a standing start the wing will hit about 80mph (indicated) with nitrous about 92mph (indicated). The megasquirt sounds real interesting, but like you said real complicated? Anyone out there played with one on the wing? Especially the timing part. Anyone with some insight? Bob.