Dumb question. Auto pistons in aircraft engine?

Aircraft powered airboat discussion.
Hjbjzj
Southern Airboat Member
Posts: 21
Joined: Sun Aug 02, 2015 10:52 am

Dumb question. Auto pistons in aircraft engine?

Postby Hjbjzj » Thu Jun 02, 2016 3:03 pm

Hey.

This might be a dumb question. But I was wondering...... can you use automotive pistons in an aircraft motor?

Why not? Has anyone ever tried?

Thanks
Justin


User avatar
John Fenner
Southern Airboat Member
Posts: 2529
Joined: Tue Feb 14, 2012 12:26 pm
Location: Miami(Cuba) Fl.

Re: Dumb question. Auto pistons in aircraft engine?

Postby John Fenner » Fri Jun 03, 2016 9:39 am

Yes, have done it many times, mostly on small continental engines. Ross builds custom sizes as well, total seal rings work great too but not in Chrome bores, as the gapless ring uses a chrome faced oil scraper ring.
I never finish anyth,,,.

User avatar
Waterthunder
Site Supporter - VIII
Site Supporter - VIII
Posts: 8160
Joined: Fri Jan 21, 2005 3:16 pm
Location: Melbourne
Contact:

Re: Dumb question. Auto pistons in aircraft engine?

Postby Waterthunder » Fri Jun 03, 2016 10:19 am

Hell ya I have used automotive pistons, rods, bearings, valves, valve seal, rocker arms lifters, I have even used Dodge slant 6 distributors.. Basically the more automotive stuff you put in them the better they run. I will say get with Total seal out of all the improvements a gapless ring set does wonders. The cut the top ring width down then add a top ring with the gaps 180 out. I have done this allot. However the ring seal is a 1000 times better than a stock AC so you must run good automotive style PC or vinton valve seals because the rings seal so much better when you let off the gas the cylinder has so much vacuum they suck oil out of the valve cover area into the chamber.

I DID A FEW 20 YEARS AGO AND WHEN YOU LET OFF THE GAS IT SMOKED LIKE A FREIGHT TRAIN. So I crossed over a automotive PC seal and installed them and no more oil passing the valve guide. That motor ran dam strong!!!!
THE PROOF IS IN THE PROP!

"If you copy someone you will only achieve what has already been done."

http://waterthunder.com/
321-508-5316

Hjbjzj
Southern Airboat Member
Posts: 21
Joined: Sun Aug 02, 2015 10:52 am

Re: Dumb question. Auto pistons in aircraft engine?

Postby Hjbjzj » Fri Jun 03, 2016 11:01 am

Well I was considering. Set of flat top pistons for a gpu 220, seeing that o470 dome pistons can be too much compression.

Good to know information. Thanks. Much appreciated

User avatar
Waterthunder
Site Supporter - VIII
Site Supporter - VIII
Posts: 8160
Joined: Fri Jan 21, 2005 3:16 pm
Location: Melbourne
Contact:

Re: Dumb question. Auto pistons in aircraft engine?

Postby Waterthunder » Fri Jun 03, 2016 11:17 am

Its common to get the dome 470 pistons chuck them in the lathe and cut a tad off the dome they run better than flat tops and can run on 93 or AV gas!
THE PROOF IS IN THE PROP!

"If you copy someone you will only achieve what has already been done."

http://waterthunder.com/
321-508-5316


Hjbjzj
Southern Airboat Member
Posts: 21
Joined: Sun Aug 02, 2015 10:52 am

Re: Dumb question. Auto pistons in aircraft engine?

Postby Hjbjzj » Fri Jun 03, 2016 12:19 pm

So you can use automotive rings with aircraft pistons then?

Also u mentioned using viton seals. What were you referring to when u said "PC"

User avatar
John Fenner
Southern Airboat Member
Posts: 2529
Joined: Tue Feb 14, 2012 12:26 pm
Location: Miami(Cuba) Fl.

Re: Dumb question. Auto pistons in aircraft engine?

Postby John Fenner » Fri Jun 03, 2016 1:43 pm

Yes you can, fitted many total seal sets to ac pistons, if you research big diesels you can find bore sizes with keystone rings too.
You need a good lathe to cut ringlands.
I never finish anyth,,,.

whee
Southern Airboat Member
Posts: 14
Joined: Fri May 27, 2016 2:38 pm

Re: Dumb question. Auto pistons in aircraft engine?

Postby whee » Fri Jan 20, 2017 2:11 pm

Any warning against running auto pistons or things to watch out for? It's looking like a may need new pistons for my CMI IO360 and my machinist buddy that is helping me with my machine work is telling me to look into getting some pistons made. Says the modern design will be way better than the 1920s design cast pistons. There are several outfits that are making custom pistons for Lycoming engines but only one making CMI IO360 pistons. An added bonus is that even custom pistons are cheaper than factory pistons.

CP-Carrillo makes a Ford 460 piston that is the right bore, the pin diameter is a touch small but that's an easy fix, and the compression height is a little short but thay can change that too. Might be a good option if they have rings that are compatible with steel bores.

dang
Southern Airboat Member
Posts: 5
Joined: Tue Nov 15, 2016 5:21 pm

Re: Dumb question. Auto pistons in aircraft engine?

Postby dang » Thu Apr 06, 2017 12:31 am

I'm interested in this too. I'm a retired machinist, working on a very budget build of a free to me pe-90. Goin automotive parts could lower cost considerably while adding performance.



Return to “Aircraft Power Only”

Who is online

Users browsing this forum: LIL Maddog and 2 guests