Re: 87 octane small block stroker?
[Re: Dougsmopars]
#485117
10/02/09 09:51 PM
10/02/09 09:51 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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You have it right then for an old school build! My stock 340 GTS needs premium also, but my hybrid LA/Mag head 360 in my B'cuda runs fine on 87.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: 87 octane small block stroker?
[Re: skep419]
#2985313
11/15/21 12:07 AM
11/15/21 12:07 AM
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Joined: Jan 2003
Posts: 10,732 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,732
North Dakota
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I'm a fan of building a street motor that you can successfully run on swill. I don't want to be in Wherethehellarewe, NV and find out that 87 octane is the only choice.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: 87 octane small block stroker?
[Re: 6PakBee]
#2985386
11/15/21 12:53 PM
11/15/21 12:53 PM
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Joined: Apr 2007
Posts: 782 Minnesota
skep419
super stock
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super stock
Joined: Apr 2007
Posts: 782
Minnesota
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I was looking into buying this rotating assembly 1-98111BI - Scat Engine Rotating Assemblies Summit Scat KitNot sure if it would run on 87 with Edelbrock 63cc heads and Felpro 1008's, Voodoo 60403 226 int./234 exh.
Last edited by skep419; 11/15/21 12:54 PM.
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Re: 87 octane small block stroker?
[Re: bigsbigelow]
#2985429
11/15/21 02:19 PM
11/15/21 02:19 PM
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Joined: Jan 2003
Posts: 27,468 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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My grandfather has the MP 406 LA stroker in his Demon. It will run on 87 with no apparent knock. We normally use 93, though, because we haven't had time to dial in the timing to use 87 and feel safe doing it. <img src="/ubbthreads/images/graemlins/Twocents.gif" alt="" /> IIRC, those are 9.0 to 1 compression and big cams that would bleed compression too.
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Re: 87 octane small block stroker?
[Re: autoxcuda]
#2985435
11/15/21 02:26 PM
11/15/21 02:26 PM
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Joined: Mar 2005
Posts: 1,552 Michigan
Kiddart
pro stock
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pro stock
Joined: Mar 2005
Posts: 1,552
Michigan
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watch the episode of Engine Masters regarding octane is a 10 to 1 Blueprint Motor. very eye opening to say the least.
Thank you Kiddart
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Re: 87 octane small block stroker?
[Re: skep419]
#2985439
11/15/21 02:28 PM
11/15/21 02:28 PM
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Joined: Jan 2003
Posts: 27,468 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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I was looking into buying this rotating assembly 1-98111BI - Scat Engine Rotating Assemblies Summit Scat KitNot sure if it would run on 87 with Edelbrock 63cc heads and Felpro 1008's, Voodoo 60403 226 int./234 exh. I have a 416 stroker with Edelbrock heads “63 cc” that we cc’d at 65 +/-1 cc. And 21cc Icon dish pistons with quench pad. Measured at 9.7:1 compression. It less than .035 quench. And has all chamber edges or potential hot spots deburred including chamber matched to bore. I have the older Comp 274-S cam with 236/241 @050 and .502/511” I can’t run 87 octane. Maybe if I dialed timing way back.
Last edited by autoxcuda; 11/16/21 12:16 PM.
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Re: 87 octane small block stroker?
[Re: dvw]
#2985836
11/16/21 04:51 PM
11/16/21 04:51 PM
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Joined: Mar 2010
Posts: 1,061 Atlanta, GA
mgoblue9798
super stock
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super stock
Joined: Mar 2010
Posts: 1,061
Atlanta, GA
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For what its worth my factory headed 360 with 9-1 comp has been 12.50@110 thru the mufflers on 87. In a 3775lb E body with a 4 speed. Doug Care to share your build?
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Re: 87 octane small block stroker?
[Re: mgoblue9798]
#2985898
11/16/21 09:10 PM
11/16/21 09:10 PM
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Joined: Jan 2003
Posts: 1,760 Windsor, ON, Canada
Diplomat360
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,760
Windsor, ON, Canada
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So how come no one is talking about the DCR? I am trying to work through this question myself (another thread), but it would seem the Dynamic Compression Ratio is really what one needs to be looking at as that accounts for the valve timing events (which are courtesy of your cam). As such, what I would love to know is the matching OCTANE<=>DCRs people have successfully ran with? To re-hash that other thread: previous 360 motor with 10.5:1 static and HE3844 flat tappet: Static compression ratio of 10.5:1. Effective stroke is 2.91 inches. Your dynamic compression ratio is 8.72:1 . Your dynamic cranking pressure is 182.97 PSI. Your effective boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.72 :1. V/P (Volume to Pressure Index) is 162
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Re: 87 octane small block stroker?
[Re: autoxcuda]
#2985949
11/16/21 11:28 PM
11/16/21 11:28 PM
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Joined: Mar 2010
Posts: 1,061 Atlanta, GA
mgoblue9798
super stock
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super stock
Joined: Mar 2010
Posts: 1,061
Atlanta, GA
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I was looking into buying this rotating assembly 1-98111BI - Scat Engine Rotating Assemblies Summit Scat KitNot sure if it would run on 87 with Edelbrock 63cc heads and Felpro 1008's, Voodoo 60403 226 int./234 exh. I have a 416 stroker with Edelbrock heads “63 cc” that we cc’d at 65 +/-1 cc. And 21cc Icon dish pistons with quench pad. Measured at 9.7:1 compression. It less than .035 quench. And has all chamber edges or potential hot spots deburred including chamber matched to bore. I have the older Comp 274-S cam with 236/241 @050 and .502/511” I can’t run 87 octane. Maybe if I dialed timing way back. Not questioning what you say, but it seems something might be off. Less than 10 to 1 with aluminum heads should be no problem with the cam you mentioned. What timing are you running? What is your AFR? Have you tried a colder plug? Also is your block an LA or Magnum?
Last edited by mgoblue9798; 11/16/21 11:32 PM.
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Re: 87 octane small block stroker?
[Re: mgoblue9798]
#2985981
11/17/21 01:57 AM
11/17/21 01:57 AM
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Joined: Jan 2003
Posts: 27,468 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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I was looking into buying this rotating assembly 1-98111BI - Scat Engine Rotating Assemblies Summit Scat KitNot sure if it would run on 87 with Edelbrock 63cc heads and Felpro 1008's, Voodoo 60403 226 int./234 exh. I have a 416 stroker with Edelbrock heads “63 cc” that we cc’d at 65 +/-1 cc. And 21cc Icon dish pistons with quench pad. Measured at 9.7:1 compression. It less than .035 quench. And has all chamber edges or potential hot spots deburred including chamber matched to bore. I have the older Comp 274-S cam with 236/241 @050 and .502/511” I can’t run 87 octane. Maybe if I dialed timing way back. Not questioning what you say, but it seems something might be off. Less than 10 to 1 with aluminum heads should be no problem with the cam you mentioned. What timing are you running? What is your AFR? Have you tried a colder plug? Also is your block an LA or Magnum? IIRC 30 adv maybe 28. Can’t remember exactly Don’t have an AFR meter Yes tried colder plug LA block Don’t forget I live in California with California blend gas: low vapor pressure, no MTBE, etc IMHO, That blanket statement about aluminum heads dropping compression a full point is overblown How much measured compression are you running with aluminum heads and 87 octane?
Last edited by autoxcuda; 11/17/21 04:25 AM.
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Re: 87 octane small block stroker?
[Re: mgoblue9798]
#2985994
11/17/21 08:30 AM
11/17/21 08:30 AM
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Joined: Mar 2006
Posts: 9,848 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,848
MI, usa
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For what its worth my factory headed 360 with 9-1 comp has been 12.50@110 thru the mufflers on 87. In a 3775lb E body with a 4 speed. Doug Care to share your build? .060" over 360, 9.0-1, Crane hyd roller HR-222/339-2S-12 IG, 1.6 Crane rockers giving .542/.563, LD340 intake w/ divider milled, 650 Holley DP, ported later model 360 heads w/2.02, TTI headers and 2.5" exh. The 12.50s were with slicks and a 4.30 gear. It's been 12.70@107 w/ 3.55 and old BFG drag radials. Always run with the air cleaner and exhaust. It has the factory 2.47 1st 4 speed and a Centerforce dual friction clutch. Doug
Last edited by dvw; 11/17/21 08:40 AM.
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Re: 87 octane small block stroker?
[Re: dvw]
#2986015
11/17/21 10:26 AM
11/17/21 10:26 AM
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Joined: Apr 2007
Posts: 782 Minnesota
skep419
super stock
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super stock
Joined: Apr 2007
Posts: 782
Minnesota
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For what its worth my factory headed 360 with 9-1 comp has been 12.50@110 thru the mufflers on 87. In a 3775lb E body with a 4 speed. Doug Care to share your build? .060" over 360, 9.0-1, Crane hyd roller HR-222/339-2S-12 IG, 1.6 Crane rockers giving .542/.563, LD340 intake w/ divider milled, 650 Holley DP, ported later model 360 heads w/2.02, TTI headers and 2.5" exh. The 12.50s were with slicks and a 4.30 gear. It's been 12.70@107 w/ 3.55 and old BFG drag radials. Always run with the air cleaner and exhaust. It has the factory 2.47 1st 4 speed and a Centerforce dual friction clutch. Doug Thanks for sharing. Also surprised this thread has this much action being as it was brought back from the dead 10/03/09 last post
Last edited by skep419; 11/17/21 10:27 AM.
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