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Author Topic: My stab at the big head/small engine build.  (Read 45871 times)
jayh
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« Reply #45 on: June 27, 2011, 07:50:01 pm »

http://forums.corral.net/forums/5-0-5-8-engine-tech/646936-big-head-small-cam-theories.html

that was an interesting read all things considered
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425" pump gas 6.2@110
David Claflin
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« Reply #46 on: July 02, 2011, 07:34:03 pm »

I liked it too, aside from the drama, there's a good amount to pick up there.
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
David Claflin
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« Reply #47 on: July 24, 2011, 06:43:20 pm »

Came across this today while doing a search
http://sbftech.com/index.php/topic,22241.0.html
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
David Claflin
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« Reply #48 on: August 16, 2011, 02:01:05 pm »

Have you made it to the track or dyno yet??
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
NIKwithoutaC
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« Reply #49 on: August 17, 2011, 05:43:46 pm »

Had it to the track once, where a failing clutch cable (one of those damn adjustable units with a bunch of miles on it) prevented me from getting any clean shifts in.  Made a couple retarded passes out of frustration grinding gears and going 14s at ~104.

Limped the car home, yanked that cable, and it looked like this:



Then I stuck a generic parts store non-adjustable cable in with a firewall adjuster.  That cable snapped after just a couple days of driving.  Don't have a picture of it, but it looked much worse than the one above.

Then the car sat for a week, and then I finally got around to ordering a proper cable from Maximum Motorsports (night and day clutch pedal feel, BTW), and I've been putting miles on the car ever since to see if this cable will last.  It's been working, but it has started to produce an odd clicking feel on my foot intermittently when I push in the clutch, which makes me nervous.

I don't know what's going on, but it ain't right.  I've been dreading it, but I think I need to pull the quadrant and inspect everything.  Everything underneath the car appears OK, so I don't know what else it could be.
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One of those silly big head/small engine cars.  302ci, TEA Twisted Wedge 205s, TFS R intake, 97mm MAF meter, very mild custom cam.
jayh
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« Reply #50 on: August 17, 2011, 11:04:31 pm »

Came across this today while doing a search
http://sbftech.com/index.php/topic,22241.0.html


Im sorry but 224@.050 isnt big. think about it. that cam might have worked decent, look at the application. I wish Jay was still around and respected his opinions but if you go farther back in time he used to suggest the holley and his early days he actually modeled up a combo and suggested a 274hr for a 302, smaller head though, but similar cam.
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425" pump gas 6.2@110
David Claflin
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« Reply #51 on: August 19, 2011, 05:26:59 pm »

I was thinking it would depend on the usage, the one DB did with a 310, had 205's on it and he made 500+HP with it, but he spun it higher. If the guy wanted something smooth with a 6K redline something smaller camwise would be better.
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
NIKwithoutaC
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« Reply #52 on: September 22, 2011, 09:23:16 am »

Took it to the track, little update-

As some of you guys know, ever since I finished my build, the car was plagued with some clutch cable issues, along with a few other small issues that I had to resolve. I had kind of been procrastinating working on it and all summer and just enjoying driving it, but last weekend I finally spent some time wrenching on it, and last night I had it on the track. Results below. Keep in mind, this is a full weight car, granny shifting on 17" street tires.

Run 1:
(3rd gear took me a couple tries... Someday I'll figure out this "driving" thing!)
60'--2.165
1/8--8.926
1/4--13.613 @ 106.45

Run 2:
(Totally walked a C5 'Vette on this run. Damn, that was satisfying.)
60'--2.206
1/8--8.751
1/4--13.336 @ 108.22

Run 3:
60'--2.209
1/8--8.750
1/4--13.307 @ 108.77

Run 4:
(Best run, and last run before they closed the track.)
60'--2.105
1/8--8.581
1/4--13.107 @ 109.33


So, I'm really confident the thing has 12s in it, as it sits, with just a little better driving. I think there is a LOT to be had in just tweaking the car itself, without touching the motor. Tune, raise the limiter so I can shift at 63-6500, 15" stickies and skinnies, and a few other things and I think this car will be much, much faster.

Thoughts?
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One of those silly big head/small engine cars.  302ci, TEA Twisted Wedge 205s, TFS R intake, 97mm MAF meter, very mild custom cam.
HIGHVOLTJ
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« Reply #53 on: September 22, 2011, 01:43:18 pm »

Need tires and a harder launch for sure, there is probably .5 there, the 60ft is way soft.
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« Reply #54 on: September 22, 2011, 02:09:51 pm »

110mph is bottom 12s.  Not just 12s.

You get your 60' to the 1.6 area and you have your bottom 12's.

At this point - I wouldnt think of touching the engine.  Some sticky tires and probably some suspension work will go a LONG LONG way!
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NIKwithoutaC
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« Reply #55 on: September 22, 2011, 02:24:22 pm »

110mph is bottom 12s.  Not just 12s.

You get your 60' to the 1.6 area and you have your bottom 12's.

At this point - I wouldnt think of touching the engine.  Some sticky tires and probably some suspension work will go a LONG LONG way!

That's what I'm thinking.  At this point, I'm confident I've got the motor to go much faster, I just need to look for it in the rest of the car and also in my driving.

I've been window shopping 15" drag wheels all day, haha.
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One of those silly big head/small engine cars.  302ci, TEA Twisted Wedge 205s, TFS R intake, 97mm MAF meter, very mild custom cam.
85_GT
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« Reply #56 on: September 22, 2011, 05:22:09 pm »

What gears?
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David Claflin
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« Reply #57 on: September 22, 2011, 06:39:10 pm »

What gears?
3.73's, first page

Not bad for a first time out, as has been mentioned sticky tires and seat time will help a lot. For comparisons sake, I had mine at a quarter mile track in Iowa last summer. Heat of the summer, no icing the intake, passenger headlight in, on 17" street tires. I managed a best 60 ft of 2.6, all my runs that I stayed in it were 13.3 @ 110. When I got back here I went to the track and ran 8.5's@84 on street tires again, pulled the headlight and iced the intake and dropped 3/10 and added 3MPH. With slicks, cool air and the driver mod you might squeeze a high 11 out of it.
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
NIKwithoutaC
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« Reply #58 on: September 23, 2011, 10:07:05 am »

Not bad for a first time out, as has been mentioned sticky tires and seat time will help a lot. For comparisons sake, I had mine at a quarter mile track in Iowa last summer. Heat of the summer, no icing the intake, passenger headlight in, on 17" street tires. I managed a best 60 ft of 2.6, all my runs that I stayed in it were 13.3 @ 110. When I got back here I went to the track and ran 8.5's@84 on street tires again, pulled the headlight and iced the intake and dropped 3/10 and added 3MPH. With slicks, cool air and the driver mod you might squeeze a high 11 out of it.

Not sure I'll ever have the driver mod, haha.  But yea, I think with some sticky tires and some better driving, mid 12s at 112 maybe...?  We'll see.  I kind of want to crack 12s on street tires, exactly as the car sits now, then maybe before next season starts, pick up a set of stickies and skinnies for it, a Quarterhorse and a few other things, and really get serious.
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One of those silly big head/small engine cars.  302ci, TEA Twisted Wedge 205s, TFS R intake, 97mm MAF meter, very mild custom cam.
289nate
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« Reply #59 on: September 23, 2011, 12:51:49 pm »

Very respectable considering your 60 ft time and full weight vehicle.  As others have said, you have a ton left in it.  The 60 ft is terrible but to be expected on street tires and your first time out with it.  12's are a cake walk with slicks. 

I feel 11's are a very realistic long term goal.  Right now your best friends will be slicks and getting some passes under your belt with this new combo.
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\'65 fastback pump gas 289, 4.56 gears, and faceplated T5.  11.123 at 122.4
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