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#1
10-31-2021, 06:01 PM
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400 ring Compressor
Working on a pontiac 400 +30 over on bore. my question is getting Ready to assemble short block will a 4.155 tapered ring compressor work or do I need to get the exact 4.150 ring compressor
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#2
10-31-2021, 06:07 PM
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You pretty much need the exact size for these.
I'd be concerned about damaging a compression ring using a taper that was even .0005 larger.
However, if the actual 'exit diameter' of the tapered compressor is the same or a tiny bit smaller than the actual bore size in your block, you should be OK. Maybe one of the professionals will chime in. I just play a Pontiac mechanic on TV...... Good luck! |
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#3
10-31-2021, 06:11 PM
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Do you already have that compressor, will it tighten down on the skirt of a piston?
__________________
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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#4
10-31-2021, 06:19 PM
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No I haven’t purchased one yet I just ask because the 4.155 is about half the price I’d really like use a tapered one over and adjustable I figured you race guys might know what I can get away with thanks
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#5
10-31-2021, 06:31 PM
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I have a 4.155 tapered bore rung compressor and a adjustable tapered ring compressor with he big hose clamp. It goes something like 4.12 to 4.25 or close to that.
The adjustable one is far superior. The fixed one is not tight on the piston and the adjustable on you can make tight as you want. There is a gap from the side of the piston leaving the rings to stick out a bit on the fixed one. No way around that. I ordered it thinking it was the best and used my old Summit adjustable. The thinner the rings the more it matters having it tight. https://www.ebay.com/itm/39361224920...b8d7fe65ba4057 |
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#6
10-31-2021, 06:53 PM
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Ok sounds good. Will get it done with my adjustable compressor. I don’t think it’s worth $70 for the 4.150 tapered compressor
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#7
11-01-2021, 04:53 PM
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I use this on all .030" over 400 Pontiac"s and 400 Chevy's
https://arp-bolts.com/kits/arpkit-de...?RecordID=3714 |
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#8
11-01-2021, 05:24 PM
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Ive used this adjustable tapered from summit racing and worked great. I do have a fixed one for the 4.350 for my other engine and very nice but was a more common size and wasn't too bad on price.
https://www.summitracing.com/parts/sme-90a4120
__________________
Illinois Outlaw Gassers 6.27@107 9.97@131 |
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#9
11-01-2021, 07:37 PM
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I did order the summit compressor. Any tips on using it. Looks like it will work good
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#10
11-01-2021, 07:42 PM
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it works great, use a little trans fluid on the skirt of the piston only, adjust compressor, and should tap down pretty easy. if using stock style rods protect the bore by putting tubing over the bolts, if using eagle type, still be careful with the bore obviously. turn the block in either case so the deck is parallel with the floor, gravity is your friend and will keep the rod in the center of the bore and be easier to be ''careful''
__________________
1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
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#11
11-01-2021, 08:36 PM
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Ok great thank you
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#12
11-01-2021, 09:54 PM
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I put Lucas oil treatment on the piston skirts. Very sticky.
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#13
11-02-2021, 05:58 AM
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I know there is no other way even with all of our high tech these days to go about installing Pistons with the rings on them, but it's still pretty barbaric!
__________________
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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#14
11-02-2021, 09:07 AM
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squeeze it and beat it!!!
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#15
11-03-2021, 12:02 AM
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Quote:
__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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