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04-26-2005, 09:29 AM
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#1 | ||||
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Registered User
Join Date: Feb 2003
Location: Frisco TEXAS
Posts: 1,662
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10.5:1 compression ratio on my 383 stroker...
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04-26-2005, 09:47 AM
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#2 |
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Registered User
Join Date: Aug 2003
Location: Imperial, MO.
Posts: 704
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Re: 10.5:1 compression ratio on my 383 stroker...
i'm sticking to exactly the same thing for my 355 hydrallic engine...
people say they run 11.5:1 but all machine shops said, even with reverse flow cooling heads u still wanna stay in the 10's... i'd say thats perfect, can't get much better than stock!
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97 z28 Forged 357 Le2 Heads, Custom Cam, Hooker Longtubes All Bolt On's |
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04-26-2005, 10:09 AM
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#3 |
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Moderator
Join Date: Dec 1969
Location: Buffalo, New York
Posts: 10,773
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Re: 10.5:1 compression ratio on my 383 stroker...
Depends on the cam, all else being equal.
Rich
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'95 Z-28 383: Procharger, nitrous, etc. BBC 27T race car. "Every man dies, not every man really lives" William Wallace (Braveheart) |
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04-26-2005, 10:26 AM
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#4 | |
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Registered User
Join Date: Sep 2003
Location: Germany
Posts: 2,389
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Re: 10.5:1 compression ratio on my 383 stroker...
Quote:
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Newbie - US ARMY - Germany 1994 formula Firebird green - RIP, for now 1995 Camaro z28 T56 3.42, kooks, Magnaflow, AFR Elbow, LPE CAI, UMI suspension stuff... |
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04-26-2005, 11:22 AM
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#5 | |
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Registered User
Join Date: Feb 2003
Location: Frisco TEXAS
Posts: 1,662
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Re: 10.5:1 compression ratio on my 383 stroker...
Quote:
The cam in my car is a custom ground Cam Motion solid roller camshaft. The specs of the cam are = 245.7/251.1, .654/.606 installed at a 111.8 Lobe seperation. The Duration is at .05 |
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04-26-2005, 12:55 PM
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#6 |
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Registered User
Join Date: Apr 2005
Location: Europe
Posts: 1,026
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Re: 10.5:1 compression ratio on my 383 stroker...
IMHO its not a daily drive cam..
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04-26-2005, 02:01 PM
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#7 |
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Registered User
Join Date: Feb 2003
Location: Frisco TEXAS
Posts: 1,662
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Re: 10.5:1 compression ratio on my 383 stroker...
Yeah, I plan on driving it around some, but mainly to local car shows and events. It should still do fine for street/strip duty, even with that cam. Jordon used that very same cam grind and loved how it acted on the street.
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04-26-2005, 02:46 PM
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#8 |
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Registered User
Join Date: Dec 2003
Location: Oklahoma where trees are made of wood.
Posts: 2,724
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Re: 10.5:1 compression ratio on my 383 stroker...
I'm running that compression in my 383 with the GM 847 cam and have never experienced ping on 91 octane gas.
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Perry, 97 WS-6 T/A, 11s without sweating. 383 ,AFR heads, GM847 cam,LT hookers Mufflex Y, 3000 vig,3.73s ,and various other mods. |
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04-26-2005, 02:48 PM
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#9 |
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Registered User
Join Date: Jan 2004
Location: San Francisco
Posts: 1,322
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Re: 10.5:1 compression ratio on my 383 stroker...
it all depends on your static compression. Dynamic compression is not all that important. My 383 is running 10.5:1 compression, and I wish I would of went with 11.5, which would of netted me a rough 8.5 static compression, which you want to stay under 9.0 for pump gas.
here is a calculator: http://www.rbracing-rsr.com/compstaticcalc.html
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1995 Pontiac TA M6 383, LE AFR'S, BAUER Cam, Kook 1 3/4 stepped to 1 7/8 Kook SS Headers, Borla, DHM, Custom Clutch, Moser 12 Bolt (4:10) All Spohn Suspension,QA1's, all the bolt ons possible, and Daily Driven. 443rwhp 408 tq |
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04-26-2005, 03:04 PM
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#10 |
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Registered User
Join Date: Feb 2001
Location: Cincinnati, Ohio
Posts: 3,070
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Re: 10.5:1 compression ratio on my 383 stroker...
That cam will be very driveable with SR ramps + cubes.
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2006 Corvette ZO6 - Bolt ons, numbers soon! 1997 Corvette M6-(SOLD) 1994 Camaro Z28 M6 - (SOLD) -383-AFRs-Single Plane-Solid Roller Best 11.98/115.44/1.68, NA, w/stock heads, 357rwhp |
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04-26-2005, 03:16 PM
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#11 | |
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Registered User
Join Date: Aug 2001
Location: Carlisle, PA
Posts: 874
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Re: 10.5:1 compression ratio on my 383 stroker...
Quote:
Dynamic is the important one...you have the right concept but switched the syntax. Dynamic must be under 9.0 for pump gas.
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Jeff 95 Z28 A couple mods, nothing worth mentioning though 
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04-26-2005, 03:39 PM
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#12 |
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Registered User
Join Date: Jan 1999
Location: Baton Rouge, la
Posts: 989  |
Re: 10.5:1 compression ratio on my 383 stroker...
I'm running 12.5 CR and race my car on pump gas most of the time. My cam is bigger than the one you listed though. No pinging and the car runs great on it. In fact..my 10.7 pass was on 93 pump gas.
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95 firebird M6, 355, stock crank, Steve Stumph/SAR2K ported lt4 heads, custom Futral Motorsports solid roller,Moser 9" with 4.71's and a spool. Madman suspension 10.39@131.6 1.42 60' NA 476 rwhp/408 rwtq(pump gas and old lt4 setup..new setup coming soon) 10.93 @ 125.8 1.47 60' Na on old lt1 heads/intake.(428rhwp/407 rwtq) |
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04-26-2005, 04:26 PM
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#13 | |
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Registered User
Join Date: Feb 2004
Location: Oshkosh, Wisconsin
Posts: 1,310
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Re: 10.5:1 compression ratio on my 383 stroker...
Quote:
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It ain't stock ....94 Z-28 A4 383 12.4:1 CR on 93 octane... Lunati Crank... Manley 6"H-beams...Mahle pro series flat tops... AI 200cc Head/Cam/Intake ... 58MM TB, Racetronix fuel system kit, Lucas 37# injectors, 160* T-stat, E.W.P., TransGo Shift kit, 3400 Edge Stall, Strange S60 w/4.10's full suspension
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04-26-2005, 05:18 PM
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#14 |
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Texas Moderator (1998-2009)
Join Date: Dec 1998
Location: DFdubya, Tx.
Posts: 1,301
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Re: 10.5:1 compression ratio on my 383 stroker...
All else being equal.. I've heard that each point of compression you come up is worth ~10hp... Personally I'd think it to be more, since any blown motor application (i.e. 9.0:1) I've seen dyno about 40rwhp less than it probably would if it were up around 11:1 . Then again.. Who am I to talk? My car only makes 385rwhp and is 12.2:1 .. lol. I suck!
next question? 
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Shawn 2006 Black Trailblazer SS - 12.25@110mph : Custom cam, Kooks LT's and 3600 Vig TC 2005 Seadoo RXP |
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04-26-2005, 05:41 PM
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#15 |
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Registered User
Join Date: Nov 2001
Location: Richardson, TX USA
Posts: 647
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Re: 10.5:1 compression ratio on my 383 stroker...
Wow, self esteem issues Mr Saladbar.
TexasTA, It really depends on the complete setup like Rich said. Its all about the dynamic compression, not the static. I am running a 12 to 1 using a solid roller thats 254/262 on a 111 LSA. It nets me a dynamic of about 8.5 to 1. BTW, can we hook up this week. Michael
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1995 Formula 383, BRE Solid Roller Cam, Larry Meaux AFR 227s, LE Victor E, Nitrous Express Plate, Fast XFI, M6 |
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04-26-2005, 05:41 PM
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