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500 stroker motor with 9.1 compression #578485 01/10/10 01:07 PM 01/10/10 01:07 PM
Joined: Oct 2004 Posts: 502 North Texas 1 1AARCUDA OP mopar
1AARCUDA OP mopar 1 Joined: Oct 2004 Posts: 502 North Texas	Would a 500 stroker motor with 9.1 compression benefit from 110 octane racing fuel or would I be wasting my money? Thanks! 1970 AAR CUDA 1970 Super Bee 383 Auto 1969 Super Bee 383 4Spd 1968 Satellite 500 Stroker 1986 Shelby GLHS 1970 Coronet 500 383 Auto 1996 Indy Pace Truck 1998 Dakota R/T 408 Stroker

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578486 01/10/10 01:17 PM 01/10/10 01:17 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	You need to know your cyl pressure to know for sure< compression test> @ 9-1 / 110 probably be a waste of money and loss of performance

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578487 01/11/10 04:56 AM 01/11/10 04:56 AM
Joined: Mar 2007 Posts: 3,285 West Coast, USA jbc426 master
jbc426 master Joined: Mar 2007 Posts: 3,285 West Coast, USA	Is it suffering from detonation on pump gas? 1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578488 01/11/10 07:42 AM 01/11/10 07:42 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Would a 500 stroker motor with 9.1 compression benefit from 110 octane racing fuel or would I be wasting my money? Thanks! Most likely it will hurt the performance unless it has a detonation issue(which I wouldnt think so)... JMO

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578489 01/11/10 10:44 AM 01/11/10 10:44 AM
Joined: Oct 2004 Posts: 502 North Texas 1 1AARCUDA OP mopar
1AARCUDA OP mopar 1 Joined: Oct 2004 Posts: 502 North Texas	Have not fired it up yet, still waiting for parts to drop it in. What about a mixture of 93 octane and 110, maybe 2 gallons of 110 to 3 gallons of 93 in a 5 gallon jug? 1970 AAR CUDA 1970 Super Bee 383 Auto 1969 Super Bee 383 4Spd 1968 Satellite 500 Stroker 1986 Shelby GLHS 1970 Coronet 500 383 Auto 1996 Indy Pace Truck 1998 Dakota R/T 408 Stroker

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578490 01/11/10 10:47 AM 01/11/10 10:47 AM
Joined: Oct 2005 Posts: 8,880 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,880 Ontario, Canada	Why not just 87 Octane regular ... it's a lousy 9:1 !!!

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578491 01/11/10 10:51 AM 01/11/10 10:51 AM
Joined: Oct 2006 Posts: 4,590 Indy J joshking440 Lunch is on me!
joshking440 Lunch is on me! J Joined: Oct 2006 Posts: 4,590 Indy	Quote: Would a 500 stroker motor with 9.1 compression benefit from 110 octane racing fuel or would I be wasting my money? Thanks! It would if you threw on a big old turbo.....come on

Re: 500 stroker motor with 9.1 compression [Re: Stanton] #578492 01/11/10 11:04 AM 01/11/10 11:04 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	Quote: Why not just 87 Octane regular ... it's a lousy 9:1 !!! if it has aluminum heads it's the same as 7.5 to 1??

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578493 01/11/10 11:18 AM 01/11/10 11:18 AM
Joined: Oct 2004 Posts: 502 North Texas 1 1AARCUDA OP mopar
1AARCUDA OP mopar 1 Joined: Oct 2004 Posts: 502 North Texas	Ok, I get it! Thanks for all the input. Happy Racing this coming year. 1970 AAR CUDA 1970 Super Bee 383 Auto 1969 Super Bee 383 4Spd 1968 Satellite 500 Stroker 1986 Shelby GLHS 1970 Coronet 500 383 Auto 1996 Indy Pace Truck 1998 Dakota R/T 408 Stroker

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578494 01/11/10 11:23 AM 01/11/10 11:23 AM
Joined: Aug 2003 Posts: 11,179 Atco NJ DJVCuda I Live Here
DJVCuda I Live Here Joined: Aug 2003 Posts: 11,179 Atco NJ	what head do you have on the motor? what are the specs? the question about detonation was a valid one and with that much stroke, and a poor combustion chamber ( open ) and no quench will result in a detonation prone environment. Race gas might be a valid solution to the black bearings you could get as a result of that combonation.

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578495 01/11/10 11:48 AM 01/11/10 11:48 AM
Joined: Jan 2003 Posts: 1,263 Southwestern Ontario Canada racealittle pro stock
racealittle pro stock Joined: Jan 2003 Posts: 1,263 Southwestern Ontario Canada	If it is aluminum heads, 87 octane will do the job. Iron heads may need 91-93 until you get things sorted. I run an aluminum head 9.3:1 440 on 87 and it's just fine. Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen! Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!

Re: 500 stroker motor with 9.1 compression [Re: DJVCuda] #578496 01/11/10 11:49 AM 01/11/10 11:49 AM
Joined: Dec 2008 Posts: 1,200 UK 6 602heavy pro stock
602heavy pro stock 6 Joined: Dec 2008 Posts: 1,200 UK	The motor will always be a pig with that CR if using alu heads , fuel 'load up' will be an issue due to the slower burn speed , i had to mill the heads fort his very reason. (600") An earlier closing intake valve would be a band aid , although it would help , using race gas (higher octane) is a bad idea due to spark lead having to be advanced so much it will slow the piston down.

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578497 01/11/10 11:53 AM 01/11/10 11:53 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	Quote: Ok, I get it! Thanks for all the input. Happy Racing this coming year. Well the 500 inches is not the requirement for octane but the final compression, coupled with cam specs and consideration for aluminum of iron heads. A 9 to 1 motor with a 204/210 duration cam @ .050 may need some extra above 93 octane while a 275/284 @ .050 may not need any octane above 93 and may well run on less aluminum heads generally will need less octane than Iron.

Re: 500 stroker motor with 9.1 compression [Re: racealittle] #578498 01/11/10 11:58 AM 01/11/10 11:58 AM
Joined: Jan 2003 Posts: 569 Pasco, WA 440mag mopar
440mag mopar Joined: Jan 2003 Posts: 569 Pasco, WA	I run an aluminum heads, 496, 9.1:1 CR with 87 octane, no problem. If I'm heading over a mountain pass I put in some 93 octane. It probably does not need it but makes me feal better.

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578499 01/11/10 12:03 PM 01/11/10 12:03 PM
Joined: Oct 2004 Posts: 502 North Texas 1 1AARCUDA OP mopar
1AARCUDA OP mopar 1 Joined: Oct 2004 Posts: 502 North Texas	Cast Iron Stage V heads from Mopar Performance, I will have time to test and tune it in Feb, but looks like I would not need to spend $8.00 a gallon on 110 1970 AAR CUDA 1970 Super Bee 383 Auto 1969 Super Bee 383 4Spd 1968 Satellite 500 Stroker 1986 Shelby GLHS 1970 Coronet 500 383 Auto 1996 Indy Pace Truck 1998 Dakota R/T 408 Stroker

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578500 01/11/10 12:05 PM 01/11/10 12:05 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	No I would think 93 would be fine what are the cam specs?

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578501 01/11/10 12:08 PM 01/11/10 12:08 PM
Joined: Oct 2004 Posts: 502 North Texas 1 1AARCUDA OP mopar
1AARCUDA OP mopar 1 Joined: Oct 2004 Posts: 502 North Texas	509 lift 248 duration @.50 1970 AAR CUDA 1970 Super Bee 383 Auto 1969 Super Bee 383 4Spd 1968 Satellite 500 Stroker 1986 Shelby GLHS 1970 Coronet 500 383 Auto 1996 Indy Pace Truck 1998 Dakota R/T 408 Stroker

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578502 01/11/10 12:12 PM 01/11/10 12:12 PM
Joined: Aug 2003 Posts: 11,179 Atco NJ DJVCuda I Live Here
DJVCuda I Live Here Joined: Aug 2003 Posts: 11,179 Atco NJ	I just witnessed a 500" , stage V headed 509 cammed motor eat itself to detonation death. Black bearings were the dead giveaway.

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578503 01/11/10 12:13 PM 01/11/10 12:13 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	mild cam on a 500 but 93 should be fine. 108 lobe separation angle? degreed at 106?? start with total timing at 30 with 93 and and move up 2 degree's at a time till 36??

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578504 01/11/10 12:19 PM 01/11/10 12:19 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	Quote: Have not fired it up yet, still waiting for parts to drop it in. What about a mixture of 93 octane and 110, maybe 2 gallons of 110 to 3 gallons of 93 in a 5 gallon jug? you probably need it. you do know the more octane you use the slower the burn rate right? I would start with regular 93 and work your way down.

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