Dome or Flat head pistons

All other non-specific model Farmall / IH / CASE tractors. (Catch-All)

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
Phillip W. Lenke
10+ Years
10+ Years
501 Club
501 Club
Posts: 1479
Joined: Wed May 25, 2005 1:21 pm
Zip Code: 43449

Dome or Flat head pistons

Postby Phillip W. Lenke » Tue Oct 13, 2009 12:09 pm

I am getting ready to finish the M Project. However I am not sure which pistons to get.
It is a distillate but am not intending on burning K1. it has a 45 head on it and seems to have the proper clearances for domes.
What are the advantage/disadvantage . of either/ or.
I need to help deciding today.
Phil
"Work Hard ,Play Often,Care Always"

RustyFarmall
5+ Years
5+ Years
Cub Star
Cub Star
Posts: 173
Joined: Fri Nov 16, 2007 4:14 pm
Zip Code: 51646
Location: New Market, Iowa

Re: Dome or Flat head pistons

Postby RustyFarmall » Tue Oct 13, 2009 12:44 pm

The dome pistons result in higher compression, thus giving more horsepower, and were original equipment on tractors with the "X1" serial number suffix, which designates "high compression, gasoline". If you will be "working" the M, go with the step head pistons. If it will be mostly a parade and show tractor, the choice of pistons really doesn't make any difference, although the lower compression, flat top pistons MIGHT result in easier starting, especially if the battery is a little weak.

User avatar
beaconlight
Cub Pro
Cub Pro
501 Club
501 Club
Posts: 7703
Joined: Thu Aug 19, 2004 2:31 pm
Zip Code: 10314
Location: NY Staten Island & Franklin

Re: Dome or Flat head pistons

Postby beaconlight » Tue Oct 13, 2009 4:33 pm

The whole idea of distilate was more power cheaper. That said do what you want.
Bill

"Life's tough.It's even tougher if you're stupid."
- John Wayne

" We hang petty thieves and appoint the great ones to public office."
- Aesop

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
501 Club
501 Club
Posts: 21531
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Dome or Flat head pistons

Postby John *.?-!.* cub owner » Tue Oct 13, 2009 8:34 pm

beaconlight wrote:The whole idea of distilate was more power cheaper. That said do what you want.
I know the idea was cheaper, and at the time that was definitely true by a large factor, but old timers I talked to that ran them said they could not tell any increase in power.
If you are not part of the solution,
you are part of the problem!!!

RustyFarmall
5+ Years
5+ Years
Cub Star
Cub Star
Posts: 173
Joined: Fri Nov 16, 2007 4:14 pm
Zip Code: 51646
Location: New Market, Iowa

Re: Dome or Flat head pistons

Postby RustyFarmall » Wed Oct 14, 2009 8:01 am

Distillate fuel was several cents cheaper than gasoline. That is why it was the main fuel of choice, but it did NOT yield more power, which is why IH offered the optional high compression, gasoline only version, which DID produce slightly more power.

Phillip W. Lenke
10+ Years
10+ Years
501 Club
501 Club
Posts: 1479
Joined: Wed May 25, 2005 1:21 pm
Zip Code: 43449

Re: Dome or Flat head pistons

Postby Phillip W. Lenke » Wed Oct 14, 2009 8:13 am

I ordered the dome style They were 60 bucks cheaper than the flat head as a whole. with the thought tat i am not running k1 I figured it would not make much difference, should I run a higher octane or would reg unleaded be OK
Thanks for the input.
Phil
"Work Hard ,Play Often,Care Always"

Jim Becker
Team Cub
Team Cub
501 Club
501 Club
Posts: 12155
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: Dome or Flat head pistons

Postby Jim Becker » Wed Oct 14, 2009 6:55 pm

The compression still won't be THAT high. Regular gas will be fine.

RustyFarmall
5+ Years
5+ Years
Cub Star
Cub Star
Posts: 173
Joined: Fri Nov 16, 2007 4:14 pm
Zip Code: 51646
Location: New Market, Iowa

Re: Dome or Flat head pistons

Postby RustyFarmall » Thu Oct 15, 2009 9:51 am

Yes, regular unleaded will be just fine. E-10 is what I use in all my tractors.


Return to “Farmall / IH / CASE”

Who is online

Users browsing this forum: No registered users and 0 guests