Compression question.

Oldschoolpony · 03-29-2001, 11:45 PM

Well, I ran a comp test. #1=190 psi, #2=190 psi, #3=189 psi, #4=189 psi, #5=187 psi, #6=190 psi, #7= 189 psi, #8=190 psi. This test was done with the motor cold and all plugs out. motor was not run for 24 hrs and headers were unhooked ( had to change plugs and headers were in the way)

Do these figures look good for a 347 w low miles? can the 187psi be because of differences in the comp chambers? They're Windsor jr's. I run premium, could I get better et's with av gas...110 octane and timing raise? Also, I finally found the engine builder, in mass. he said the person that owned this car previous to me dumped alot of money into this car. I was told it had a billet crank, how does that compare to a forged crank? also told me it had some really high end rods, maybe eagle's. he's mailing mee all the invoices monday. If they are eagle rods, does eagle make good high end rods?

Jeff Chambers · 03-30-2001, 07:21 AM

Sounds great. If its really got a billet crank and Eagle rods, you've got a great foundation there. Even if you sell the car somewhere down the road, I'd pull the motor and hang onto it. Billet cranks are expensive and Eagle rods aren't cheap. If the old owner went to that expense, I'd bet there's a bunch of top notch parts throughout.

The compression numbers are fine. As a matter of fact with only 3psi variation they're about as close to perfect as possible.

------------------
Jeff Chambers
Trophy Stock #3
11.86 Seconds / 113.8 MPH
Chambers Racing Team

dinomite · 03-30-2001, 07:34 AM

Ya, those numbers are really good. If you do have a billet crank and eagle rods, youve got a great setup. Given that you have all that, if you slap a girdle on that thing you could blow it.....as long as the pistons are good, which I'd bet they are comparable too the rest of the motor (good).

Stang_ROTY · 03-30-2001, 05:38 PM

Can I get the name of the engine builder from Mass. b/c I live in Massachusetts and am having a hard time finding experienced shops that could give me some advice for my 393 combo?

------------------
In-progress Street Legal
351..(So far)Edlebrock Performer RPM head, Upper&Lower Manifold..Crane Gold 1.6 Rollers..BBK 70MM TB..Full Cartech Fuel System..30lb Injectors..
Sothside Machine bars&sub-frames..Air Bag rear end..3.73's..???Tranny

Oldschoolpony · 03-30-2001, 07:22 PM

The builder was performance automotive in ply. mass

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03-29-2001, 11:45 PM	#1
Oldschoolpony Registered Member Join Date: Mar 2001 Location: Gainsville,Fl Posts: 229	Compression question. Well, I ran a comp test. #1=190 psi, #2=190 psi, #3=189 psi, #4=189 psi, #5=187 psi, #6=190 psi, #7= 189 psi, #8=190 psi. This test was done with the motor cold and all plugs out. motor was not run for 24 hrs and headers were unhooked ( had to change plugs and headers were in the way) Do these figures look good for a 347 w low miles? can the 187psi be because of differences in the comp chambers? They're Windsor jr's. I run premium, could I get better et's with av gas...110 octane and timing raise? Also, I finally found the engine builder, in mass. he said the person that owned this car previous to me dumped alot of money into this car. I was told it had a billet crank, how does that compare to a forged crank? also told me it had some really high end rods, maybe eagle's. he's mailing mee all the invoices monday. If they are eagle rods, does eagle make good high end rods?

03-30-2001, 07:21 AM	#2
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Sounds great. If its really got a billet crank and Eagle rods, you've got a great foundation there. Even if you sell the car somewhere down the road, I'd pull the motor and hang onto it. Billet cranks are expensive and Eagle rods aren't cheap. If the old owner went to that expense, I'd bet there's a bunch of top notch parts throughout. The compression numbers are fine. As a matter of fact with only 3psi variation they're about as close to perfect as possible. ------------------ Jeff Chambers Trophy Stock #3 11.86 Seconds / 113.8 MPH Chambers Racing Team

03-30-2001, 07:34 AM	#3
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	Ya, those numbers are really good. If you do have a billet crank and eagle rods, youve got a great setup. Given that you have all that, if you slap a girdle on that thing you could blow it.....as long as the pistons are good, which I'd bet they are comparable too the rest of the motor (good).

03-30-2001, 05:38 PM	#4
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	Can I get the name of the engine builder from Mass. b/c I live in Massachusetts and am having a hard time finding experienced shops that could give me some advice for my 393 combo? ------------------ In-progress Street Legal 351..(So far)Edlebrock Performer RPM head, Upper&Lower Manifold..Crane Gold 1.6 Rollers..BBK 70MM TB..Full Cartech Fuel System..30lb Injectors.. Sothside Machine bars&sub-frames..Air Bag rear end..3.73's..???Tranny

03-30-2001, 07:22 PM	#5
Oldschoolpony Registered Member Join Date: Mar 2001 Location: Gainsville,Fl Posts: 229	The builder was performance automotive in ply. mass