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Author
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Topic: Large diameter distributor cap VS old style?
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mustangboy
Gearhead Posts: 652
From: Ont, Canada
Registered: Mar 2002
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posted 06-01-2003 09:31 PM
  
Help me out guys.I just bought a new set of Taylor 8mm plug wires and looms and I'm custom fitting them to the engine.I was going to switch to the newer style cap with the posts rather than the old style 60s cap as I've heard with the bigger distance between posts on the newer style cap that there is less chance for misfiring.The trouble is my air cleaner hits on one of the posts.Turning the distributor only makes it worse.Also I prefer the look of the old style cap on my "classic".Is there really much improvement to be had using the new style cap, or will I notice any difference up to around 6000 rpms?I'm running a pertronix ignition and the big Accel yellow coil.------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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KULTULZ
Gearhead Posts: 290
From: Rockville, MD
Registered: Oct 2002
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posted 06-01-2003 09:55 PM
quote:
Is there really much improvement to be had using the new style cap, or will I notice any difference up to around 6000 rpms?I'm running a pertronix ignition and the big Accel yellow coil.
The larger cap style was designed for the higher voltage of the TFI system. As long as you are using a good quality cap and rotor, you should have no internal cross-fire problems.
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indyphil
Gearhead Posts: 773
From: Lafayette, IN, USA
Registered: Jul 2002
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posted 06-01-2003 10:15 PM
I run a pertronix ignitor II. I noticed a big difference when i swapped from the small cap to the big one. I could see the cross fire on my small cap with the strobe light it was making my idle rough. The big cap is the way to go for performance but its up to you. If you dont see any cross firing with the strobe light then I wouldnt bother. I have the cheapo Mr gasket air filter (14 inch open element - chrome) and it fits with that. I also went to 9mm wires at the same time, I guess the crossfire could have been in my 6 month old 7mm wires instead? ------------------
'68 coupe 289 C code
66 heads, edel 600cfm carb, performer intake, dual exhaust
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TomP
Gearhead Posts: 4812
From: Delta BC Canada
Registered: Dec 99
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posted 06-02-2003 12:19 AM
A 14" air cleaner is only 14" for a reason... that's stock C-H-E-V-Y. Tho not common, a smaller Ford Hi-Po size fits nicer. The cap isn't a real big deal, if you can fit it, fine, if not it won't cost any power.
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Rory McNeil
Gearhead Posts: 1210
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 06-02-2003 02:43 AM
Ford Motorsport sells a 13" chrome open element air cleaner assembly that clears the larger dist.cap just fine. On my race car I used to use the smaller, early style cap, never had a problem.------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA Stocker 302 5speed. soon to be under the index!
59 Meteor (Canadian Ford) 2 dr sedan 332, auto
74 F350 ramp truck 390 4spd
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mustangboy
Gearhead Posts: 652
From: Ont, Canada
Registered: Mar 2002
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posted 06-02-2003 01:19 PM
Thanks guys.I think I will just stick with the small style.$150 bucks for wires and looms,got to buy new heater hoses because they're too short and interfere with the looms,new cap and rotor $30 bucks.I really don't want to spend another $75 or so to get a new air cleaner as well.This was just supposed to be a simple wire swap.  ------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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MDF99
Gearhead Posts: 197
From: Hamilton, Ohio, USA
Registered: May 2001
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posted 06-02-2003 03:38 PM
I run the 13" chrome Ford air cleaner that Rory was referring to. It clears my large MSD dist. cap and costed about $35.
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Fastymz
Moderator Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 06-02-2003 04:09 PM
I run a 14" air cleaner it clears the large cap just fine. 
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SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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N266fords
Gearhead Posts: 557
From: Spokane ,WA USA
Registered: Apr 2003
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posted 06-02-2003 04:16 PM
My drop base 14 inch unit does hit the# 1 spark plug with the large cap also, so I notched to clear no problems yet..Bruce
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