i am building a farmall h up to put a turbo on it. i have rebuilt the motor with domed pistons and overbore sleeves. how much will these pistons raise the compression? the dome is flat and is about 1/4'' tall . would the tractor run fine with these and a 8 psi turbo or should i get low compression pistons or a water to air intercooler?
- Thread starter R&W
- Start date
caterpillar guy
Well-known Member
Either the intercooler or the lower compression pistons. Either should work. I do think the pistons would be cheaper route If haviing to buy the parts.
Dieseltech
Well-known Member
- Location
- Akron, Indiana
He could mill the dome off the pistons he has now too, instead of buying four more..
PretendFarmer
Well-known Member
I would find a distillate head and use flat top pistons if I wanted to build an H with a turbo. Low compression is critical.
John M
Well-known Member
- Location
- Nunyafn business
I see lots of parts in your future.
fastfarmall
Well-known Member
Too much compression with a turbo creates too much heat, and not much power.
If you are trying to get more power you have to have more room to stuff in more air/fuel mixture to get a bigger boom . High compression pistons decrease the amount of space you have to pack in air and fuel and negate the benefit of a turbo. Good for naturally aspirated does not necessarily work for turbocharged engine. You also don't want a huge turbo , as small as possible to minimize lag and maximize low end power. Look at the newer GTDI auto engines , some of those turbos have smaller impellers than your old Hoover sweeper and they spool up almost instantly. You have to look at the whole package.
mattwillson
Member
What head do you have for it? Distilate or
gas? I turbo'd an M..flat top pistons and
Distilate head, I then changed to a LP head.
Now it's making power. Distilate head gave
75psi compression, LP head makes 155psi
compression. Turbo puts 15 psi boost. I
modified a 80's dodge distributor to get
electronic ignition.
gas? I turbo'd an M..flat top pistons and
Distilate head, I then changed to a LP head.
Now it's making power. Distilate head gave
75psi compression, LP head makes 155psi
compression. Turbo puts 15 psi boost. I
modified a 80's dodge distributor to get
electronic ignition.
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