Landracing Forum

Fundraising, For sale, and Wanted => Items Wanted => Topic started by: jim reed on August 12, 2015, 09:29:22 PM

Title: wanted: supercharger for 50cc engine
Post by: jim reed on August 12, 2015, 09:29:22 PM

I am looking for a 1967-68 Porsche 912 twin rotor, roots type, smog pump to use on a 50cc pushrod motor I am building. I believe it was also used on VW buses from that era. The unit is suitable for engines of 33-300cc displacement.  772-468-2144  reedspeed1@aol.com  Jim Reed

Title: Re: wanted: supercharger for 50cc engine
Post by: donpearsall on August 12, 2015, 11:38:53 PM

I hope you get what you are looking for.

But I have always wondered about using superchargers on very small engines like this. Can they increase power more than they take to turn? They of course take energy from the crankshft, but what is the advantage of using a supercharger over a turbo charger which uses no crankshaft power? Not enough exhaust pressure from the small engine?

Thanks
Don

Title: Re: wanted: supercharger for 50cc engine
Post by: generatorshovel on August 13, 2015, 03:11:09 AM

Although it has been done Jim, I doubt the energy taken to drive a supercharger could match the power gains it would produce ???
http://www.bugattirevue.com/revue29/t72.htm
An Aussy mate , Dave Plecas, is so close to getting a compound turbo setup working well on a 125cc single, actually it already works well, (111 mph) but has yet to be unleashed  :-o
My supercharged 250/4 looses 10 bhp driving the blower

Title: Re: wanted: supercharger for 50cc engine
Post by: jim reed on August 13, 2015, 11:26:31 AM

Thanks for the comments. I got interested in the idea after seeing Anders Elsberg's site and talking to him. He has successfully supercharged Honda 50 engines and has used them in a beautiful 50cc road racing GP bike he also built for vintage road racing in Germany.   

Title: Re: wanted: supercharger for 50cc engine
Post by: mtkawboy on August 13, 2015, 12:02:25 PM

Ive seen 70s Ford smog pumps used. I don't know if they actually did anything or just got them into a blown class

Title: Re: wanted: supercharger for 50cc engine
Post by: RichFox on August 13, 2015, 12:09:35 PM

I saw a little single out there once, with a smog pump. He ha remover the hose between the pump and his carburetor. Said it was faster that way.

Title: Re: wanted: supercharger for 50cc engine
Post by: Seldom Seen Slim on August 13, 2015, 02:14:22 PM

I remember Fritz Kott putting a smog pump on his bike's engine a handful of years ago - so he could run in a blown class.  It turned by belt -- but didn't do anything to force induction.

As I remember -- that's how the rules got tweaked to say that a blower must increase the pressure going into the carb. :roll:

Title: Re: wanted: supercharger for 50cc engine
Post by: 4-barrel Mike on August 13, 2015, 05:19:48 PM

A couple local links with pertinent (perhaps) info:

http://www.landracing.com/forum/index.php/topic,12245.0.html (http://www.landracing.com/forum/index.php/topic,12245.0.html)

http://www.landracing.com/forum/index.php/topic,4962.0.html (http://www.landracing.com/forum/index.php/topic,4962.0.html)

 :cheers:

Mike