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high egt #1631090
06/09/14 04:46 PM
06/09/14 04:46 PM
Joined: Jun 2004
Posts: 378
bc canada
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67valiant Offline OP
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67valiant  Offline OP
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bc canada
ok im running a 406 with a 570 comp cam 850 speed demon 11.1 comp indy heads 360-1 temps were 1400f with egt in #3 and #8 jetting the front up from 86 to 90 temp now 1250 -1300 on #3 jetted back up from 92 to 98 still have 1400 on #8 was at 33 degree went to 35 still about the same is it the gas im using ? I run av 100 the guy use to run 92 mix with 108 50/50 with a 830 holley any ideas ?

Re: high egt [Re: 67valiant] #1631091
06/09/14 04:55 PM
06/09/14 04:55 PM
Joined: Feb 2014
Posts: 655
Huntsville, AL
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Airwoofer Offline
mopar
Airwoofer  Offline
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Posts: 655
Huntsville, AL
Is the #8 header tube crushed?

Re: high egt [Re: Airwoofer] #1631092
06/09/14 05:04 PM
06/09/14 05:04 PM
Joined: Jun 2004
Posts: 378
bc canada
6
67valiant Offline OP
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67valiant  Offline OP
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bc canada
nope new motor last year no probs at all

Re: high egt [Re: 67valiant] #1631093
06/09/14 05:24 PM
06/09/14 05:24 PM
Joined: Jun 2003
Posts: 52,968
Romeo MI
MR_P_BODY Offline
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MR_P_BODY  Offline
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Posts: 52,968
Romeo MI
Very well could be the fuel... I've never tested with
AV gas so I dont know for fact.. put some race fuel
in it to see if it is the fuel... I normally run at
1250 + 50
EDIT
Also if you have tested for best MPH you could be
adding fuel and not burning it(fat in the cyl) and
its burning in the tubes... for a quick check add
2 more jet sizes and see if your EGT goes up higher

Last edited by MR_P_BODY; 06/09/14 06:06 PM.
Re: high egt [Re: 67valiant] #1631094
06/09/14 05:33 PM
06/09/14 05:33 PM
Joined: May 2014
Posts: 103
muskegon MI
v cummins Offline
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v cummins  Offline
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muskegon MI
Check out a four pattern cam with # 8 exhaust opening two degrees earlier and intake closings two two degrees later. can do all long runners but just doing # 8 will work fine. Do you have a single plane intake ?

Re: high egt [Re: v cummins] #1631095
06/09/14 06:43 PM
06/09/14 06:43 PM
Joined: Jun 2004
Posts: 378
bc canada
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67valiant Offline OP
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67valiant  Offline OP
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bc canada
sounds good mr p I did look at the plugs it they did look lean and when I jetted up rear the egt stayed the same 1400 1425 and ya its single plain idy intake

Last edited by 67valiant; 06/09/14 06:51 PM.
Re: high egt [Re: 67valiant] #1631096
06/09/14 07:37 PM
06/09/14 07:37 PM
Joined: Aug 2003
Posts: 39,976
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Are you using all eight EGTs or moving them araound? If all eight, it may be time to start working on the intake manifold to cure the fuel distribution problems


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: high egt [Re: Cab_Burge] #1631097
06/09/14 08:21 PM
06/09/14 08:21 PM
Joined: Jun 2003
Posts: 52,968
Romeo MI
MR_P_BODY Offline
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Posts: 52,968
Romeo MI
Quote:

Are you using all eight EGTs or moving them araound? If all eight, it may be time to start working on the intake manifold to cure the fuel distribution problems




I'm thinking he has 2 and thats it... I use the egts
on all of the tubes at 1" to balance the intake

Re: high egt [Re: MR_P_BODY] #1631098
06/09/14 09:44 PM
06/09/14 09:44 PM
Joined: Jul 2004
Posts: 19,301
State of confusion
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Thumperdart Offline
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Posts: 19,301
State of confusion
Quote:

Quote:

Are you using all eight EGTs or moving them araound? If all eight, it may be time to start working on the intake manifold to cure the fuel distribution problems




I'm thinking he has 2 and thats it... I use the egts
on all of the tubes at 1" to balance the intake





THIS................At Pettis when I worked in the dyno room settin everything up to be run in we used all 8 and Jason said it was the best way he knew to do it and I didn`t question him either way.


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.....
Re: high egt [Re: Thumperdart] #1631099
06/09/14 10:34 PM
06/09/14 10:34 PM
Joined: Jan 2005
Posts: 2,506
Milwaukee WI
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TRENDZ Offline
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Milwaukee WI
Late ignition will cause high egts without engine melt down.


"use it 'till it breaks, replace as needed"
Re: high egt [Re: TRENDZ] #1631100
06/13/14 09:14 PM
06/13/14 09:14 PM
Joined: Jun 2004
Posts: 378
bc canada
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67valiant Offline OP
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67valiant  Offline OP
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bc canada
ya just 2 egt probes one on #3 and #8 ya so I was thinking to bump timing up ? to 36-38 it was on dyno with 830 annular with no probs







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