Can someone double check some final comp numbers
#2617089
02/04/19 11:32 PM
02/04/19 11:32 PM
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pittsburghracer
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"Little"John
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"Little"John
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I went from 93 pump gas builds to alcohol type builds so final compression numbers weren't very important to me but I'm almost ready to install my 572 and gotta figure out what race gas I will be needing for this build.
Engine specs 572 cubic inch. 4.500 bore-4.500 stroke pistons. Nitrous inverted dome -24cc Cometic head gasket 4.540 bore .060 thick was told its 15.92cc B1 head chamber 67.5cc
Using an online calculator I'm getting 107.4cc 11.91 compression.
Last edited by pittsburghracer; 02/04/19 11:32 PM.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Can someone double check some final comp numbers
[Re: pittsburghracer]
#2617098
02/04/19 11:40 PM
02/04/19 11:40 PM
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WHITEDART
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I love the oxygenated fuel.. like q16 or something along that line. More than likely you may be able to get away with some C12 depends on the budget you have set for your project
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
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Re: Can someone double check some final comp numbers
[Re: WHITEDART]
#2617101
02/04/19 11:42 PM
02/04/19 11:42 PM
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pittsburghracer
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"Little"John
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"Little"John
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I love the oxygenated fuel.. like q16 or something along that line. More than likely you may be able to get away with some C12 depends on the budget you have set for your project VERY low budget but I will run one higher grade than needed because of the planned nitrous hit. LOL.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Can someone double check some final comp numbers
[Re: pittsburghracer]
#2617113
02/04/19 11:56 PM
02/04/19 11:56 PM
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Posts: 3,036 bean town ....Ca
WHITEDART
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I love the oxygenated fuel.. like q16 or something along that line. More than likely you may be able to get away with some C12 depends on the budget you have set for your project VERY low budget but I will run one higher grade than needed because of the planned nitrous hit. LOL. q16 was the fuel of choice in Ultra for the nitrous car If you tow the car up and back you will be surprised at how little fuel you actually use. Towing up and back. I use less than a half a gallon per pass.. shakes out to be about $10 a run
Last edited by WHITEDART; 02/05/19 02:37 AM.
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
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Re: Can someone double check some final comp numbers
[Re: WHITEDART]
#2617117
02/05/19 12:08 AM
02/05/19 12:08 AM
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pittsburghracer
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"Little"John
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I’m a one man show so I will be driving it up and back
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Can someone double check some final comp numbers
[Re: pittsburghracer]
#2617150
02/05/19 01:32 AM
02/05/19 01:32 AM
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fast68plymouth
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Assuming zero deck and 1cc for area above the rings, I get 11.82.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Can someone double check some final comp numbers
[Re: a493demon]
#2617166
02/05/19 02:23 AM
02/05/19 02:23 AM
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pittsburghracer
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"Little"John
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Appreciate the second set of eyes guys. Heck maybe I can run BP93 pump gas with this combo.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Can someone double check some final comp numbers
[Re: Al_Alguire]
#2617227
02/05/19 10:57 AM
02/05/19 10:57 AM
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pittsburghracer
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"Little"John
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I thought 11.9-1 WAS pump gas Heck that’s the highest compression I’ve had in an engine for over 8 years. Lol. Lots of horsepower left on the table with this engine setting it up for nitrous. These were Jason Dixbys rods and pistons from when he switched over to turbo power.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Can someone double check some final comp numbers
[Re: Bob_Spelic]
#2617321
02/05/19 02:56 PM
02/05/19 02:56 PM
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at zero deck, I get 11.87. at .020 in the hole I get 11.37 on my home brew spreadsheet calculator.
bob Thanks guys. It’s zero deck.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Can someone double check some final comp numbers
[Re: pittsburghracer]
#2617333
02/05/19 03:04 PM
02/05/19 03:04 PM
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"Little"John
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It probably won't be a very competitive combo but I will get my feet wet with nitrous. Someone said I was scared to go fast so I should be ok going a little slower. LOL. Untitled by John Cadamore, on Flickr Untitled by John Cadamore, on Flickr Untitled by John Cadamore, on Flickr
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Can someone double check some final comp numbers
[Re: pittsburghracer]
#2617354
02/05/19 03:54 PM
02/05/19 03:54 PM
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madscientist
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Is that the CR you were shooting for? If so, golden. If not...bummer.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Can someone double check some final comp numbers
[Re: madscientist]
#2617378
02/05/19 04:57 PM
02/05/19 04:57 PM
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pittsburghracer
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"Little"John
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Is that the CR you were shooting for? If so, golden. If not...bummer. I honestly didn’t have a target in mind. I had this engine together with a set of Wiseco pistons as a NA combo. I talked to Vic at Wisco and he recommended only hitting them with 200-250. I had bought a set of nitrous pistons from Jason Dixby when he was switching to turbo power so I used those pistons in this build. I have a Sledgehammer plate system that is good for a 300-700 hit
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Can someone double check some final comp numbers
[Re: pittsburghracer]
#2618872
02/08/19 11:09 PM
02/08/19 11:09 PM
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n20mstr
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What cam is in it ? I ask because a nitrous grind that opens the exh really early, would benefit from more compression. Also how much nitrous are you going to use ? Depending on the cam, it might want 13 or more. You know what your doing with an engine, so you'll learn through testing . Also are the chambers softened on your heads ?
....BAD A$$ STREET CAR.....
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