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#1
10-08-2017, 11:33 AM
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Compression Test Numbers - what to expect?
I am about to do a compression test on the 462 11.5:1 motor in my signature.
What sort of compression numbers should I expect ?
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 1981 Trans Am - Dark Maple Metallic 1976 Pontiac 455(462), Kauffman Northwind Intake, Performer RPM Eheads, 11.5:1 compression, Crower 60919 cam, Venolia domed pistions, Dougs Headers, Pypes 2.5" Dual Exhaust/X-Over, Solid Body Mounts, GenIV SFCs, FiTech EFI, Walbro 400lph pump, TanksInc. EFI tank. MSD 6AL2, MSD ProBillet. |
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#2
10-08-2017, 11:45 AM
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a lot depends on the cam.Tom
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#3
10-08-2017, 12:04 PM
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I think once you have all Cylinder pressures marked down you will find your issue!
Probably over #175 & up I would be happy with. I know that motor very well & it was very strong! John
__________________
 1970 GTO Judge. New times 10.60/126 with a 1.45 60ft.2002 FIREHAWK-conv. 6-sd. 1969 Carousel red Judge Ram Air IV 722 heads. 4-sd. Black interior. |
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#4
10-08-2017, 12:15 PM
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Hi John !
It is still very strong after switching from the solid race cam and lifters to the more street friendly 60919...and to match the lower stall and gears (3:08) But the #2 plug is getting heavy carbon, so I am testing to check it and get reference #"s recorded. |
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#5
10-08-2017, 12:39 PM
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It will be interesting to see the #'S from Cylinder 2 compared to the rest. Did you change the valve seals. Can you pull the cover on that side & do a visual after you check the compression. Never know I've seen seals lifted off the seat.
John
__________________
1970 GTO Judge. New times 10.60/126 with a 1.45 60ft.2002 FIREHAWK-conv. 6-sd. 1969 Carousel red Judge Ram Air IV 722 heads. 4-sd. Black interior. |
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#6
10-08-2017, 12:51 PM
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Mine used to do 225'ish with a 246/253 cam. 230 to 235 with a 230 cam.
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#7
10-08-2017, 12:56 PM
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I replaced all the valve seals as the new springs had smaller inner diameter. They are the blue/ metal type. But that will easy to check.
__________________
1981 Trans Am - Dark Maple Metallic 1976 Pontiac 455(462), Kauffman Northwind Intake, Performer RPM Eheads, 11.5:1 compression, Crower 60919 cam, Venolia domed pistions, Dougs Headers, Pypes 2.5" Dual Exhaust/X-Over, Solid Body Mounts, GenIV SFCs, FiTech EFI, Walbro 400lph pump, TanksInc. EFI tank. MSD 6AL2, MSD ProBillet. |
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#8
10-08-2017, 01:10 PM
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Time to upgrade!
Maybe it's time to upgrade to a 535!!!!!
I'm thinking to upgrade to an all Aluminum block with a pro charger set up! There's a IIAII pump gas motor with SD Daves top end PKG. in your area!!! I'm thinking about a street combo with a pro charger & 1000hp. 
__________________
1970 GTO Judge. New times 10.60/126 with a 1.45 60ft.2002 FIREHAWK-conv. 6-sd. 1969 Carousel red Judge Ram Air IV 722 heads. 4-sd. Black interior. |
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#9
10-08-2017, 01:25 PM
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He he... I am at Stormin's now...he is not home...maybe I will just hook up his trailer and do another swap
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#10
10-08-2017, 01:44 PM
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Ha ha! That's a nice trailer eh! Nice Greek Colours!!!! Yes he's got a beauty all Aluminum in his Firebird now!
I'm Jealous!
__________________
1970 GTO Judge. New times 10.60/126 with a 1.45 60ft.2002 FIREHAWK-conv. 6-sd. 1969 Carousel red Judge Ram Air IV 722 heads. 4-sd. Black interior. |
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#11
10-08-2017, 03:32 PM
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Your strangling those heads with that Performer Intake you know?
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#12
10-08-2017, 04:10 PM
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Color of your car is amazing.
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#13
10-08-2017, 04:11 PM
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Quote:
The RPM was not in stock and I was rushing to make the Bandit Run. With my flat air cleaner cover, I had maybe 1.25in. clearance with the turbo hood. Figured with a bubble top lid (which it should have) I would lose that clearance. Even though the motor is used to running on the track at 6000+ , I would not be taking it there driving around town. Not an expensive upgrade when I need it however. I had to cut the intake .080 to get it to fit, so no return is possible either. |
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