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05-17-2010, 11:24 AM
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CC Member
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Join Date: Jul 2008
Location: Driftwood,
TX
Cobra Make, Engine: Contemporary Cobra, 427 side oiler
Posts: 1,850
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Not Ranked
Comp 294S owners check in here
I have 3600 miles on my side oiler with this cam. I like it, but am curious what others have experienced with respect to manifold vacuum, carb selections and tuning, head selections etc. With stock MR heads and a Sidewinder intake mine only makes about 7-8" Hg at idle. Sounds cool and makes excellent power but has presented some challenges getting the carb set right at idle and transition, in particular the Holley 3255-1.
Jim
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05-17-2010, 04:58 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
50 looks and not one Mary Comp owner...
Us he-man UltraDyne guys would kill to see vac numbers of 7 or 8.
You can get a regular (not smooth) idle mix and good transition-I have it. I'm maybe 3/8 turn out from seated on both of them and just touch 7".
You gave Keith your numbers and he can't find the sweet spot?
__________________
Chas.
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05-17-2010, 05:11 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Ahhh, my "old school" Ford K cam, 13" of vacuum, thank you very much. 
Last edited by patrickt; 11-02-2016 at 11:38 AM..
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05-17-2010, 05:39 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
Quote:
Originally Posted by patrickt
Ahhh, my "old school" Ford K cam, 13" of vacuum, thank you very much.
 |
BRRRaaaahahahahaha...
Guys on here are screaming HP and dyno numbers like phone numbers and you're bleating about yer VACUUM numbers... 
Go to your room... 
Oh and why does it say "427" on there---lose a cubic inch somewhere????
__________________
Chas.
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05-17-2010, 05:41 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by ERA Chas
BRRRaaaahahahahaha...
Guys on here are screaming HP and dyno numbers like phone numbers and you're bleating about yer VACUUM numbers...
Go to your room... |
Hey baby, I can clean rugs with my vacuum. |
05-17-2010, 06:09 PM
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CC Member
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Join Date: Jul 2008
Location: Driftwood,
TX
Cobra Make, Engine: Contemporary Cobra, 427 side oiler
Posts: 1,850
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Not Ranked
Quote:
Originally Posted by patrickt
Hey baby, I can clean rugs with my vacuum. |
Looks like you already cleaned your engine bay with it. You should make the bold move and actually drive that car. 
P.S. You need more cam.
Last edited by elmariachi; 05-17-2010 at 06:11 PM..
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05-17-2010, 06:13 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
I still think the fins in your water pump are upside down. I bet if you flipped them over your vacuum would improve.  |
05-17-2010, 06:23 PM
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CC Member
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Join Date: Jul 2008
Location: Driftwood,
TX
Cobra Make, Engine: Contemporary Cobra, 427 side oiler
Posts: 1,850
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Not Ranked
Quote:
Originally Posted by patrickt
I still think the fins in your water pump are upside down. I bet if you flipped them over your vacuum would improve. |
Well, there goes my thread.
I am in DC this week, want a driving lesson? I ain't skeered. |
05-17-2010, 06:25 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
Quote:
Originally Posted by elmariachi
Looks like you already cleaned your engine bay with it. You should make the bold move and actually drive that car.
P.S. You need more cam. |
-and accurate valve covers and less roll bars.
Dude, I tried to get you some knowledgeable help on here but all we got was the Felix Unger of replicas. 
Seriously, I've got a little bit bigger cam and the low end of your readings but it carburates perfectly.
__________________
Chas.
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05-17-2010, 06:30 PM
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CC Member
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Join Date: Jul 2008
Location: Driftwood,
TX
Cobra Make, Engine: Contemporary Cobra, 427 side oiler
Posts: 1,850
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Not Ranked
Quote:
Originally Posted by ERA Chas
Dude, I tried to get you some knowledgeable help on here but all we got was the Felix Unger of replicas. |
Now THAT is funny.
Quote:
Originally Posted by ERA Chas
Seriously, I've got a little bit bigger cam and the low end of your readings but it carburates perfectly.
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My current carb issues aren't directly related to low vacuum. But low vacuum tends to make more complex the delicate balance between idle position screws and transition slots etc. I've managed to get this damn Holley 3255 "project" running quite well on this engine thank you very much, 30 hours and several hundred dollars later I might add. If my day job goes to hell, I am opening a carb shop. |
05-17-2010, 06:38 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by ERA Chas
... but all we got was the Felix Unger of replicas. |
And I was going to let you play with my new Inductive DC Ammeter....  |
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