Engine Mods...

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.

Cosmic_Jumper wrote:

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

Nope. Not annoyed one bit.
Actually happy that someone else is pioneering this.
If this all works out, then people will have a blueprint to upgrade their wings with.

bobhrc1: Here is a link to someone that took a silverwing engine and turbocharged it and installed it in a snowmobile.

Silverwing engine Turbocharged

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!

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

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.

bobhrc1 wrote:

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.

When I first heard of megasquirt, I thought it was a porn-related device.

Comments take a whole new meaning when you think of the megasquirt that way.
Gotta time that squirt....

Got the Silverwing out of mothballs. Video of wing drag racing a Harley. Check facebook. Scroll down on right - check the hammer out.

https://www.facebook.com/McChesney-Motors-121940804599560/

Just saw the video.
Never saw a silverwing lift the front tire off the ground like that.  Good job!

Although to be fair,
Even stock Silverwings can out accelerate most stock Harleys.... :lol!:

Thanks so much for following up after such a long time. Great video. That wheelie shows just how effective a Dr Pulley HiT clutch can handle torque. Do you recall which springs you are using? The OEM clutch would have turned to dust under those circumstances.

With all those engine mods is the scoot able to be used in day-to-day traffic?

Tim

Very impressive! That's what I'd call a sleeper alright. That SW could make some HD riders shed tears. You should warn them about what's going to happen so they don't fall off their bikes in shock.

I have heard.... WT?. Have you done to that thing on more then one occasion. Lol. Those weren't stock Harleys running that night. The new HD's are getting considerably faster!

Wouldn't matter about the HD, it's rider was probably in a state of shock if he saw that! :not worthy:

bobhrc1 wrote:

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.  

don't waste your time and money on cams and pistons ,just put a supercharger on it and a programmable ecm , it will pull a gmc jimmy after that mod , that's what i would do anyway these days , lol .

i have built a few honda cb 750 race bikes , it seemed far easier and cheaper to it 30 years ago ,

the last cbk i built , used a wiseco 950 cc big bore kit , wiseco ultra race cam , shaved , ported and polished head , race valves and springs , race clutch ,sharpened , lightened , blueprinted the crank and rods , kerker 4 into one race header , ported and jetted keilhin slide bores , super coils and race points , a beast of a pro street bike , 9 second flat quarter mile times ,a production v max and a v65 didn't have a chance against it , a definite widowmaker , but it was fun as heck to rip the throttle on .

hey i have beat corollas and v6 mustangs red light to red light on the s-wing with a Little more juice i bet you could take on a mustang gt .

bobhrc1 wrote:

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.  

Hi,nice project and fair play for tuning up your Silverwing.
Dont know if you are still on the forum or an active member.
How was your dealings with web cams?
Did you go for a mild or aggressive regrind?
Thanks.

He hasn't visited the forum since September, 2016.

MikeO wrote:

He hasn't visited the forum since September, 2016.

Ah shame.
Thanks for the heads up.