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Harley Twin Cam 88ci Engine for Aircraft

PostPosted: Sat Aug 14, 2004 2:17 am
by Sean_Caranna is where I found out about this. Does anyone know more about it?

PostPosted: Tue Aug 17, 2004 4:33 pm
by Johnny luvs Biplanes
This came up on another forum last year, it got poo poo'ed for bad drive design and suspect cooling issues. This was only peoples opinion though based on study of available info!

PostPosted: Thu Aug 19, 2004 4:09 am
by Brett
The only cooling issues we have had is getting it warm enough.
We have had no problem keeping them cool.
As for the drive the first one we did now has over 200 hours on it with no problems.

PostPosted: Sat Aug 21, 2004 7:08 pm
by Johnny luvs Biplanes
Are you the manafacturer of this set-up?
If so how about a detailed report on various forums?

PostPosted: Sun Aug 22, 2004 12:21 am
by Brett
Yes that would be me. I could do that. What other forums did you have in mind?

PostPosted: Sun Aug 22, 2004 7:14 pm
by Johnny luvs Biplanes
Hi Brett,
Here would be a start, also: http//
There are plenty of other places listed on the Homebuilt website.
How about EAA pages, lots of scope there.
I wish you the best of luck with the project.

PostPosted: Mon Aug 23, 2004 12:59 am
by Brett
Thanks I'll check them out.

PostPosted: Mon Aug 30, 2004 1:09 am
by Sean_Caranna
I was looking at the dyno charts on your web page. I'm sure these are crank HP/TQ numbers but they are impressive.

I was wondering what has been changed on the engine for aircraft use. Heads, Carb, Ignition, Cams, Aircleaner? I looks like a nice flat torque curve for a twincam. This can't be a "drag" type exhaust. Can it?

PostPosted: Tue Aug 31, 2004 10:33 pm
by Brett
Yes these are crank HP #'s.
We change them all except the heads. If we change the heads then we can get more out of it. But most people don't want to spend the extra money. On my plane I have a stright pipe " drag style" exhaust. We can get about 8 more hp. if we use a 2 into 1 exhaust. But I wanted the sound for fly overs and shows etc.


PostPosted: Tue Sep 11, 2007 2:50 pm
by jd
sounds like somebody didnt design a good cooling duct for the heads.if ya use synthetic oil and a oil cooler ya get more performance and longevity on yer mill.check out clotz scooter oil.