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Re: 500 stroker motor with 9.1 compression [Re: Quicktree] #578505 01/11/10 12:28 PM 01/11/10 12:28 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	Do a compression test hot spark plugs all out carbs off or wide open I think you will see 150 to 155 cranking compression right at the edge for iron heads on 93. run without vacuum advance then later only on ported vacuum tuning out any light throttle cruise ping. one place 93 is bad is guys trying to squeeze 1/10 of a mile to a gallon out with the vacuum advance 93 will not take the light throttle 46 to 54 98 to 102 octane in 68 would allow??

Re: 500 stroker motor with 9.1 compression [Re: Quicktree] #578506 01/11/10 01:14 PM 01/11/10 01:14 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Quote: 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. That's a lower CR but a lot of cubes with a mild cam. I would do the initial break-in with a mix of pump 93 and race gas, just to feel safe during the cam break-in and initial driving stages. After than I'd go with straight pump 93 and tune/step down from there.

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578507 01/11/10 01:47 PM 01/11/10 01:47 PM
Joined: Oct 2004 Posts: 502 North Texas 1 1AARCUDA OP mopar
1AARCUDA OP mopar 1 Joined: Oct 2004 Posts: 502 North Texas	I had no clue 110 burns slower, I will go with straight 93 and test and tune from there. Makes sense that my car ran slower toward the end of my season I was running straight 110, It was a 440 with 9.5.1 compression, I thought i could run better with straight 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] #578508 01/11/10 01:48 PM 01/11/10 01:48 PM
Joined: Oct 2004 Posts: 502 North Texas 1 1AARCUDA OP mopar
1AARCUDA OP mopar 1 Joined: Oct 2004 Posts: 502 North Texas	What is Black bearing? Never heard that term before 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: DaytonaTurbo] #578509 01/11/10 05:22 PM 01/11/10 05:22 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	Quote: Quote: 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. That's a lower CR but a lot of cubes with a mild cam. I would do the initial break-in with a mix of pump 93 and race gas, just to feel safe during the cam break-in and initial driving stages. After than I'd go with straight pump 93 and tune/step down from there. I meant to say probably don't need it

Re: 500 stroker motor with 9.1 compression [Re: Quicktree] #578510 01/11/10 06:08 PM 01/11/10 06:08 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Quote: Quote: Quote: 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. That's a lower CR but a lot of cubes with a mild cam. I would do the initial break-in with a mix of pump 93 and race gas, just to feel safe during the cam break-in and initial driving stages. After than I'd go with straight pump 93 and tune/step down from there. I meant to say probably don't need it Yeah that's what I figured. That's why I say he's better off safe than sorry during the initial break-in process. Once the cam break-in's done and a little driving under his belt and some tuning done, pump gas should do him fine.

Re: 500 stroker motor with 9.1 compression [Re: 1AARCUDA] #578511 01/11/10 10:09 PM 01/11/10 10:09 PM
Joined: Mar 2003 Posts: 600 Spartanburg SC MoparDan mopar
MoparDan mopar Joined: Mar 2003 Posts: 600 Spartanburg SC	Quote: What is Black bearing? Never heard that term before i was wondering the same thing..

Re: 500 stroker motor with 9.1 compression [Re: MoparDan] #578512 01/12/10 08:03 AM 01/12/10 08:03 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	When I stated I just saw black bearings on a 500 CI stage V head 509 cammed motor it was from constant detonation. This car was tuned with a AF meter and was not lean or rich in any spots - had over 30k street miles and couple hundred passes at the track. The Black bearing was on the back of the bearing and was a dead giveaway to detonation in the motor. The black is caused by the heat.

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