Re: Should 500" stroker start easily on 91 pump gas
[Re: 68charger440strk]
#1871374
07/16/15 03:32 AM
07/16/15 03:32 AM
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Joined: Jun 2006
Posts: 5,173 CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,173
CT
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The engine should still start like normal. Normally I would say your initial timing is probably off, but most engines will start happily at 18.
What are you running for an ignition system? And what spark plugs? Are you running a really cold plug to combat the detonation?
I'm sure you were told last year, but your pinging problem is 10.5:1 compression with (what I assume is) no question.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: Should 500" stroker start easily on 91 pump gas
[Re: 68charger440strk]
#1871466
07/16/15 11:30 AM
07/16/15 11:30 AM
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Joined: Jun 2008
Posts: 102 Colo
PJ68RT
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member
Joined: Jun 2008
Posts: 102
Colo
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Have you checked that you are getting good spark at start up? Do you know what fuel pressure to the carb? Is that the regular performer cam (204 @ .050) or the RPM cam (238 @ .050)?
Just curious...what's your actual (not corrected) cranking compression?
Last edited by PJ68RT; 07/16/15 11:41 AM.
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Re: Should 500" stroker start easily on 91 pump gas
[Re: 68charger440strk]
#1871489
07/16/15 11:59 AM
07/16/15 11:59 AM
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Joined: Jan 2003
Posts: 17,928 Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,928
Akron, Ohio
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I have a 500" low deck with 10.5:1 compression, MP 557 cam, MW Eddy heads, Pertronix Ignitor3 distributor, and a ProSystems 950hp carb. It starts, runs, and drives like a new car. I locked out the timing so it's always about 32 degrees, it's a street only car.
Last edited by ProSport; 07/16/15 11:59 AM.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: Should 500" stroker start easily on 91 pump gas
[Re: 68charger440strk]
#1871510
07/16/15 12:41 PM
07/16/15 12:41 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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I`ve been modifying many carbs but prefer modern billet ones since the base plates don`t warp(4150)like the alum. ones and the blocks are WAY less porous and easier to drill and tap for my tunes. Even the new carbs are in need of mods to clean up the idle/transition and cruise........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Should 500" stroker start easily on 91 pump gas
[Re: 68charger440strk]
#1872081
07/17/15 12:55 AM
07/17/15 12:55 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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The lower octane rated fuel will burn faster and should be easier to start the eng on. I know in the colder weather in the winter my buddies 68 Cuda thats an 11.5 Indy headed 440 will start easier on the pump then it does on race fuel since the race fuel is slower burning. Course my 63 always starts easy on the 92 pump I run. Ron
Last edited by 383man; 07/17/15 12:55 AM.
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Re: Should 500" stroker start easily on 91 pump gas
[Re: 68charger440strk]
#1872158
07/17/15 03:31 AM
07/17/15 03:31 AM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
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master
Joined: Oct 2007
Posts: 4,219
New York
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Where is your choke indexed? Vacuum break?
Boffin Emeritus
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Re: Should 500" stroker start easily on 91 pump gas
[Re: 383man]
#1872196
07/17/15 09:01 AM
07/17/15 09:01 AM
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Joined: Jan 2003
Posts: 8,222 Plymouth, MI
Blusmbl
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master
Joined: Jan 2003
Posts: 8,222
Plymouth, MI
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The lower octane rated fuel will burn faster and should be easier to start the eng on. I know in the colder weather in the winter my buddies 68 Cuda thats an 11.5 Indy headed 440 will start easier on the pump then it does on race fuel since the race fuel is slower burning. Course my 63 always starts easy on the 92 pump I run. Ron It's not just the octane- fuel purchased from a pump in the colder months in northern climates has better cold start characteristics than summer blend fuel. It's more volatile, even for the same octane rating.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: Should 500" stroker start easily on 91 pump gas
[Re: 68charger440strk]
#1872576
07/17/15 10:14 PM
07/17/15 10:14 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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I'd be interested to see how that e-85 carb works out for you. I see you are from Aurora. I'm at 225 and iliff. I have had the electric choke set all over the place and I do have a spacer on it too. Once it warms up the plugs look clean and it runs pretty good. No stumble or pinging anymore; it's the starting/idle circuit that is killing me. If it doesn't start up easily at first then it quickly fuel fouls the plugs and then won't start without cleaning or replacing the plugs. That is why I'm wondering of the slop in the butterfly shaft is causing problems with the idle circuit transfer slots being exposed at varying amounts. I'm running ngk xr5 plugs. You guys don't think a 950 would be too much for my mild build? I think the NGK "5" heat range plugs are a hot plug, and should be fine. I would remove the carb to check how far open the throttle blades are at idle and if they are exposing too much of the transition slot. It sounds like you have a pretty mild cam, so I don't think it would need a bunch of throttle opening at idle? I'll send you a PM, You live pretty close by.
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