ub moline compression

[moline ub special]

i have a ub pulling tractor 4232 heads 5.25 bore and 7" stroke what should i be running for compression? i only have 175 fresh motor i think there is something wrong with the valves seating i have another ub with 4232 heads and it has 225 pounds compression

 

[LW]

Impossible to figure unless you know where the top of the piston is, I'll bet it's down some.

 

[Anonymous-0]

Like Lw said, plus, I thought I explained that to you, with reguards to the cam profile and overlap...

 

[Anonymous-0]

How does it run? Compression pressure at cranking speed doesent mean it wont perform at rated speed. If all 4 cyl are the same it doesent have a mechanical problem.

 

[LW]

I couldn't agree more.

 

[LW]

Also with a stock combustion chamber in this head you would be right @ 16:1 if the piston was O deck height.

 

[moline ub special]

I don't remember anyone explaining anything to me and i simply asked a question i don't care what you say i have two identical tractors with 4232 heads and there is 50 pounds compression difference and the cam timing don't have a thing to to with compression if the guy did the motor right

 

[Jeff Gravert]

The UB tractor was not designed for that type of configuration. A red faced U or a 5 Star are the only ones capable of such compression ratios
. Once you have installed your engine into the proper chassis the compression will automatically adapt itself to the proper winning level. This message is being brought to you at midnight powered by several busch light beers. Jeff

 

[LW]

LOL!

 

[Anonymous-0]

(quoted from post at 16:58:39 06/11/12) I don't remember anyone explaining anything to me and i simply asked a question i don't care what you say i have two identical tractors with 4232 heads and there is 50 pounds compression difference and the cam timing don't have a thing to to with compression if the guy did the motor right

quoteCAM timming doesnt have a thing to do with compression. That thinking is exactly whats wrong with your engine . Change your thinking and your engine will change. Cause intake valve closing point abdc has all to do with cranking psi.

 

[mightymolinekid]

Just thinking out loud here, so before any bashing keep that in mind....is the engine broke in yet? If the other one has a bunch of run time on it, could it just be the difference in the rings being seated and everything broke in? Just asking....

 

[Anonymous-0]

If this was Facebook, id hit like...lol

 

[moline ub special]

just as i figured bunch of no it alls on here you can't ask a question without starting a war and out of ten people you would be hard pressed to find 1 guy that actually knows what he is talking about i didn't do the motor i thought i had a guy do it that knows what he is doing but i guess not if i only have 175 psi and yes its broke in should have taken it to baker if i wanted it done right

 

[Anonymous-0]

Know it alls? What you need to learn to do S T F U when someone is talking, because it was explained. Ask your grandpa. I bet he listened. I'm sure u are a nice guy n all, but you are too busy talking about everything other than listening to the answer of the question you asked. You obviously have no concept of engines and mechanical workings. You don't have two identical engines. And furthermore, Im not sticking up for ANYONE, but its funny you mentioned going to Gary, after you stood there and whined about his M's and what h,e gets out of a motor. Well played...

 

[Mopower]

If I remember correctly, you have a 606 & a 436 engine. The same exact heads on two different size engines will make different compression if both engine's pistons come to the top of the blocks. Normally the larger engine will have nore compression. However, the pistons on your bigger 5.25 are "in the hole" a good half inch or so at the top of the stroke, increasing your chamber volume and lowering your compression ratio.

 

[moline ub special]

I guess you are right unstylish i might not be an ace mechanic but i do know how to use a telephone and anyone will tell you that compression makes hp and if that tractor only has 175psi of compression that means someone should have used a different piston or rod to bring the compression up to at least 225 and yes of course i whined about the farmalls cause i am sick and tired of gettin beat by them you would think after giving a guy over 9000.00 this year and five trips over there he would be more concerned on his reputation and fixing the problem then what i know and furthermore it don't even have much more power than before still running same gear as 436 cu in smokes,has low compression pops threw the exhaust oh yeah i forget i know nothing but i do know this i wasted alot of money on this job cuz i will be whining for another year cuz this tractor will never match those farmalls the way it runs they actually run smooth and sound crispy not like a boatancher

 

[Anonymous-0]

(quoted from post at 05:09:56 06/13/12) I guess you are right unstylish i might not be an ace mechanic but i do know how to use a telephone and anyone will tell you that compression makes hp and if that tractor only has 175psi of compression that means someone should have used a different piston or rod to bring the compression up to at least 225 and yes of course i whined about the farmalls cause i am sick and tired of gettin beat by them you would think after giving a guy over 9000.00 this year and five trips over there he would be more concerned on his reputation and fixing the problem then what i know and furthermore it don't even have much more power than before still running same gear as 436 cu in smokes,has low compression pops threw the exhaust oh yeah i forget i know nothing but i do know this i wasted alot of money on this job cuz i will be whining for another year cuz this tractor will never match those farmalls the way it runs they actually run smooth and sound crispy not like a boatancher

pops through the exhaust . thats the problem bad valve job or weak valve springs. just my 2 cents.

 

[Mopower]

My Pabst Blue Ribbon logic concurs.

 

[Mopower]

This .060 overbored 403 powered UB with late stock manifold and carb and plain 4210 heads beats these Farmalls from time to time. You have a fairly competitive speed limit setup despite a few technical shortcomings. However, it is not a 4th gear tractor, at least with your stock induction system, gear ratios, and tires. I hope you get it to your liking. The 627 I've got coming ought to utilize the necessary upgrades needed for proper air delivery and a mild 4th gear. Ignore my world class paint job.