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Author Topic:   Metric engine set-back
STREET16
Dirt Maniac

Total posts: 158
posted July 27, 2004 10:32 AM  
I want to set the engine back on a GM metric. The track rules allow the engine to be set-back so that #1 sparkplug is no more than 1" behind the upper ball joint. The problem is that the rules also require that the OEM firewall be mounted in the stock location. I figure with the proper application of sledgehammers and a porta-power, I can reshape the firewall. I would like to know if any of you have gone through this and what kind of problems I'm likely to encounter. Thanks.

WesternAuto17
Dirt Forum Champ
Total posts: 569
posted July 27, 2004 01:00 PM  
You might want to check closer into those rules. If you beat a hole in it and "reshape", technically, it won't still be stock. That might be one of those dumb deals where they say you can move the motor but not the floor, thus making it a mute point.

If it were me, I'd cut a hole in the firewall and put the engine where it goes. Than I'd box the hole back in with new sheetmetal.

You will be beating on that thing for years if you try to just dent it with a sledge and a porta-power.

Flanndad
Dirt Freak

Total posts: 255
posted July 27, 2004 01:27 PM  
Make sure you set the caster and camber in the front end correct before you mount the engine, because that ball joint will not be in the same place as stock, and both side's will be different when your done.

Set the engine with transmission in as close as possible. Then mark the outline with some chalk, get out the torch cut it out.
Save that piece of metal, for the next rule change, in case you need to move the engine forward again. You will have a easy patch piece.

eaton89
Dirt Freak

Total posts: 268
posted July 28, 2004 11:03 PM  
I moved mine back and down a little. Had to notch the cross member for fuel pump and cut a "T" in the fire wall to get enough room plus I beat the **** out of it with a sledge. When I got it where I wanted it I welded the fire wall back to gether.

bigcityracer
Dirt Freak

Total posts: 431
posted July 29, 2004 04:02 PM  
I BEAT MINE BACK, NOTCHED THE CROSS MEMBER FOR FUEL PUMP. ENDED UP REMOUNTING THE GAS PEDAL TOO. IT WAS LAYING ON THE FLOOR INSIDE. (LOL). THE OTHER DIFFICULT PART WAS GETTING GOOG CLEARENCE FOR THE TRANNY DIPSTICK. THAT'S THE BIG JOB! PURCHASE STOCK RADIATOR HOSES FOR A 77 MONTE CARLO, PERFECT FIT. WELL WORTH THE EFFORT. GO FOR IT!!!

cd2
Dirt Maniac

Total posts: 161
posted July 29, 2004 08:09 PM  
street16,got caught up in that same deal once before myself. Took a good look at the car & did not think about beating the fire wall back with a sledge hammer. What us dumb clucks did was move the body back something like 1-1/2 to 2 " still had that stock firewall also.Where the upper control arm mounts are welded on the frame we ground the weld off & moved the mounts back 1 " also this gave like 4 degree caster if i remember right.Moved the radiator back also,if the rule says you can move the engine back then you should be able to move every thing else back also. If i remember right i think that same car was the one the chassis drew up 2 " in front of the rear trailing arm mounts.After all this it had a good rear percentage .Never had any trouble when it went through tech. Not telling anyone to do this but if done right & neat i think it will pass on tech. A lot of work but it was worth every bit of it. cd2

eaton89
Dirt Freak

Total posts: 268
posted July 29, 2004 09:30 PM  
I had to move pedals back to forgot about that. I also moved the seat back. I like the idea of moving body back. Sounds like a good idea.

Ego Racing
Dirt Forum Champ
Total posts: 724
posted July 30, 2004 12:52 PM  
They had a rule like that at a track we ran at. It said stock firewall in the stock location. At our track I think that ment it had to be behind the engine. We had a guy with the stock firewall where the speedometer should have been. They called him legal! Check the other cars and see what they are doing. Before we build a car for someone we will go to the track or tracks they are going to run and build it to the rules they allow.

backwoodsracer
Dirt Forum Racer

Total posts: 88
posted August 01, 2004 10:09 AM  
It seems at some tracks you have to read the rules for the class your running and then have a lawyer or political offical tell you the differance between what you read and what they actualy mean.Generally you need someone thats played the game to teach you how to work the gray area of the rule book.

STREET16
Dirt Maniac

Total posts: 158
posted August 01, 2004 10:46 AM  
I talked to the tech inspector, who's also a local racecar builder. He told me that I can't move the entire firewall back, but that I could cut out the center area enough to accommodate the set back - including the tranny tunnel. He recommended making the tunnel cover removable since I run a standard. I see what you mean about the fuel pump. I was so caught up with the fire wall, I missed it. Thanks.

    

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