Need Setup Advice From Experienced Drag Racers

Make your Cougar run faster, handle better, and jump higher... okay maybe not jump higher. If you feel the need for speed, this is the place.
banjojelly
Registered Member
Posts: 14
Joined: 03 Mar 2015, 11:48

Re: Need Setup Advice From Experienced Drag Racers

#21

Post by banjojelly » 10 Oct 2018, 11:14

xr7g428 wrote:
10 Oct 2018, 10:55
The Pertronix is basically just a solid state relay, an on off switch. It doesn't boost voltage or anything like that. Since we don't have the car to play with there is no way to tell what exactly went wrong. Here is an article that explains it pretty well FWIW. https://mgaguru.com/mgtech/ignition/ig104.htm
Looking back it could have been other things. It could be the coil voltage between the HEI and the flamethrower that came with the Pertronix was different enough to call for different heat on the plugs. (Although I think I checked this too) I am just going to file it under "Couldn't fix it with a hammer, therefore it was an electrical problem" and move on. I wouldn't be afraid to run one again. I just have a lot of money tied up in this motor so far and my past experience has made me a little gun shy.

User avatar
BossElim69
Supporting Member
Supporting Member
Posts: 2093
Joined: 07 Mar 2011, 13:18
Location: Michigan

Re: Need Setup Advice From Experienced Drag Racers

#22

Post by BossElim69 » 10 Oct 2018, 12:07

I have dished top with AFR 205 heads with 58cc chamber running 10.5 compression. Cam lift is .688' exh & .715 Int
Attachments
piston clearancesmall.JPG
piston clearancesmall.JPG (66.14 KiB) Viewed 124 times
small2.JPG
small2.JPG (72.64 KiB) Viewed 124 times
Brian Carpenter, President CATS classic Cougar club
67 Cougar road course racer
67 Cougar project car
67 Cougar GT
68 XR7-G trailer queen restoration.
68 Restomod
69 Boss 302 Eliminator
69 XR7 390 survivor
69 XR7 428CJ 4spd
70 Boss 302 Mustang
1993 Harley Davidson
2004 F250 diesel
2004 Jeep Overland 4.7L H.O.
78 Ford F 150 Ranger
08 Cobalt SS

banjojelly
Registered Member
Posts: 14
Joined: 03 Mar 2015, 11:48

Re: Need Setup Advice From Experienced Drag Racers

#23

Post by banjojelly » 10 Oct 2018, 12:40

BossElim69 wrote:
10 Oct 2018, 12:07
I have dished top with AFR 205 heads with 58cc chamber running 10.5 compression. Cam lift is .688' exh & .715 Int
How much clearance do you have now? I am running flat tops but my lift is only around 500 on both.

User avatar
BossElim69
Supporting Member
Supporting Member
Posts: 2093
Joined: 07 Mar 2011, 13:18
Location: Michigan

Re: Need Setup Advice From Experienced Drag Racers

#24

Post by BossElim69 » 10 Oct 2018, 15:12

I ended up with .124” I think the minimum you want is .080” to .100” I had enough material to work with on top of the piston to get to that number without any concerns. I cc the piston before & after and then adjusted it with the head gasket thickness.
Brian Carpenter, President CATS classic Cougar club
67 Cougar road course racer
67 Cougar project car
67 Cougar GT
68 XR7-G trailer queen restoration.
68 Restomod
69 Boss 302 Eliminator
69 XR7 390 survivor
69 XR7 428CJ 4spd
70 Boss 302 Mustang
1993 Harley Davidson
2004 F250 diesel
2004 Jeep Overland 4.7L H.O.
78 Ford F 150 Ranger
08 Cobalt SS

MadMerc3
Supporting Member
Supporting Member
Posts: 23
Joined: 11 Jan 2016, 22:16

Re: Need Setup Advice From Experienced Drag Racers

#25

Post by MadMerc3 » 20 Nov 2018, 17:33

Dont know if this will be read......but CAMSHAFT Duration/ cylinder head flow/ compression ratio/ final drive rations......these must be in a well sorted combo or everything else you try will have limited results...notice I did not say "GEAR RATIO" very important to consider the tire diameter along with the rear gear ratio....to work with CAMSHAFT DURATION....not lift ....when you get your combo sorted......make changes to achieve consistency NOT ET .........and most importantly....HAVE FUN
https://youtu.be/IagqRYL1VOg
Blessed Mother of Acceleration Dont Fail Me Now 8-)

Post Reply