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Author Topic:   Somehow I have lost 2 tenths!
70coupe
Gearhead

Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 10-14-2002 01:42 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
I went through all my numbers over the last few months and my average time is 12.09 at a corrected altitude of 2000'. My last few times out my average is 12.30 at 2000' wind conditions are the same. I've changed the plugs,wires and distributor as mentioned before, so that is out. Next I'm thinking valve springs or cam which have also been mentioned by helpful m&m posters. How should I go about checking the cam? Should I remove it or try to figure it out by checking the valve train? Whats the best way to do this?
Thanks,
Brian.
ps I still have that very small poping sound out the tail pipe at 4000 rpm and over when in neutral.

------------------
351c 4v clsd heads
60'1.619
1/8 [email protected]
1/4 [email protected]

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Rustang1
Gearhead

Posts: 110
From:
Registered: Nov 2000

posted 10-14-2002 02:08 PM     Click Here to See the Profile for Rustang1   Click Here to Email Rustang1     Edit/Delete Message   Reply w/Quote
If you haven't already I'd pull the plugs (maybe take a quick look at how they're burning), if they look alright, run a compression check or leakdown. If you suspect cam problems a compression check would probably be more effective. Sounds to me like a valve/seat problem.

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1968 Mustang,Clevor,C4
1969 Torino 351C 4spd
1978 F150 460 C6
1978 F150 351W C6

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 10-14-2002 02:15 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
How's your speed?

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
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NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
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Quote #1: "I never met a magazine mechanic I liked."
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70coupe
Gearhead

Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 10-14-2002 02:27 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
Mph seems to be down by 1 in the 1/4 and .7 or so in the 1/8th.

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steve'66
Gearhead

Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000

posted 10-14-2002 03:20 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
How do your 60'ers compare?


SteveW

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70coupe
Gearhead

Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 10-14-2002 03:45 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
My 60's are fairly consistant. 1.62-1.63 for most. Best ever of 1.610
I ran an [email protected] about a month ago with a corrected altitude of 1809'. Yesterday,I ran an [email protected] but the corrected altitude was -12'. Thats quite a difference in air. The difference in air temp alone was 80F down to 53F for the 11.99?
I should have gained some HP with that air and ran in the neighbourhood of .18-.20 faster.

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Mike_R
Gearhead

Posts: 151
From: Indianapolis, IN 46237
Registered: Feb 2001

posted 10-14-2002 04:57 PM     Click Here to See the Profile for Mike_R   Click Here to Email Mike_R     Edit/Delete Message   Reply w/Quote
As far as the misfire, Once the ignition has been ruled out, I start looking at the valvetrain. I would pull the valvecovers and check the rocker arms, pushrods, etc. They may either need adjustment or have some sort of problem you're not aware of.

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Fordwiser
Gearhead

Posts: 217
From: Metamora, Illinois
Registered: Dec 2000

posted 10-14-2002 06:25 PM     Click Here to See the Profile for Fordwiser   Click Here to Email Fordwiser     Edit/Delete Message   Reply w/Quote
MSD rev control chips has been known to go bad, would be a quick and easy test to pull it out and see if it still has the miss, before you tear into the engine.
Roger

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70coupe
Gearhead

Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 10-14-2002 06:41 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
Yea, I replaced the chip with another one to see if that would help. NO luck! But thanks,
anyways.
Brian

I will post the results on the weekend when I get a chance to get at the motor.

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