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1150 EF updating project

Folloed your like till I found this gem..
image.php
 
I finally get a frame and other parts finished for the painting ( it?s are in the painter now ) and start with the engine . First thing I found was broken was inner clutch . The metal insert was loose in the hub . Now I need to buy new one . Hope that was the first and last thing broken inside the engine .
 
lecroy said:
Do you have a source for a good one? Do you just need something stock?
Click to expand...

I know where I can buy/order new original inner clutch . If you know where to buy better than stock clutch basket ( cheaper than APE racing parts ) , I?m interested .
 
I have one that I will be pulling off my street bike the winter. It should be in good condition, but it's stock. By the time you buy the springs, rivets, billet basket, gear and backing plate the only thing you may be able to use is some of the oil residue.

I do see them from time to time on eBay. You may also want to look in the dragbike.com parts for sale listings.

I take it that your going to make that blower do something.
Just an FYI, I ran a turbo with about 7PSI on a stock 83 engine for years on the street with no problems. I later put a small slick under it. I never lost the basket or the clutch. You may not need much better than some good stock parts.
 
I?m going to buy new stock inner clutch , stronger back plate with hd-springs & rivets and new friction discs with stronger springs . I think thats enough for my applications .

I need to take apart rest of the engine and examine all parts .
Next week I?m going to port the cylinder head . Match intake manifold to the head and measure combustion chambers / smooth sharp edges .
I can take some pics , if you are interested .
 
"I can take some pics , if you are interested ."

You should know by now that several of us are always very interested in your photos. Your fab work is top notch!

I think your right about the clutch. Even the stock backing plates are fine as long as you put some tangs on the gear to support it.

I understand the port matching, but why port the head on a blower bike?
 
lecroy said:
I understand the port matching, but why port the head on a blower bike?
Click to expand...

I don?t really port the head , I only going to smooth rough surfaces . I take the pics before and after .
BTW why not port blowered engine ( if there is something to port ) . Actually many bikes has too big ports form factory .
 
"Our goal is to always max out the flow relative to valve size." Paul Gast

The head has a lot to do with how they keep making the smaller engines have more power. I need to take some pictures of some of the head my friends use. One is a pro-mod engine and this thing is opened up so big that there are no intake spigots! Next time I am out to the shop I'll take some pictures for you.

Those little flaws and bends won't mean much to a compressor pushing air into the engine. It's the nice part about the compressor, we don't need a fancy head and high compression pistons.
 
lecroy said:
"Our goal is to always max out the flow relative to valve size." Paul Gast
Those little flaws and bends won't mean much to a compressor pushing air into the engine. It's the nice part about the compressor, we don't need a fancy head and high compression pistons.
Click to expand...

That?s why I can leave the intake port smaller to get better torque when engine is not under boost . Exhaust port is different story . Engine is 1150 cc and if ?t gets 50% more air/fuel mixture , so exhaust ports should flow like 1750 cc normally aspirated engine .
 
Consider that when Terry Kizer was setting all those national records, he was doing it with stock cams and a stock head. The only change was to the valve seat pressure.

I have never played with a blower in my life. What you would seem to have going for you is that you don't have the back pressure. With a turbocharger, the exhaust pressure before the turbine is about the same as the manifold pressure. My back pressure is higher. I have to increase the seat pressure on the exhaust valves as well as the intake. It would seem that you only need to up the intake.

Any idea how much pressure you plan to run with it?
 
lecroy said:
Consider that when Terry Kizer was setting all those national records, he was doing it with stock cams and a stock head. The only change was to the valve seat pressure.

I have never played with a blower in my life. What you would seem to have going for you is that you don't have the back pressure. With a turbocharger, the exhaust pressure before the turbine is about the same as the manifold pressure. My back pressure is higher. I have to increase the seat pressure on the exhaust valves as well as the intake. It would seem that you only need to up the intake.

Any idea how much pressure you plan to run with it?
Click to expand...

Nice fab work Blower. You're certainly a man on a mission. What Lecroy has said about keeping the porting and cams stock rings true.
It's a pity that others tweeking their road machines haven't taken notice of the fact the records are broken by guys like Terry Kizer using cleverly tuned stock setups. You can't retain good bottom end performance with too radical modifications. If you're racing, then that's a different story!
 
lecroy said:
Consider that when Terry Kizer was setting all those national records, he was doing it with stock cams and a stock head. The only change was to the valve seat pressure.

I have never played with a blower in my life. What you would seem to have going for you is that you don't have the back pressure. With a turbocharger, the exhaust pressure before the turbine is about the same as the manifold pressure. My back pressure is higher. I have to increase the seat pressure on the exhaust valves as well as the intake. It would seem that you only need to up the intake.

Any idea how much pressure you plan to run with it?
Click to expand...

Charging air pressure is going to be under 10 psi , so I think I don?t need to put any stronger valve springs to get more seat pressure ( if thats what you mean ) .
 
Yes, that and just to get an idea of what your up to. You will know if the springs are too weak.
 
Two hours porting yesterday and only intake ports inlets ported . From 34.5mm (1.34") to 37mm (1.45") .

Before :

102_0965.jpg


And after :

102_0966.jpg



Before :

102_0964.jpg


And after :

102_0967.jpg
 
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