65 Cobra 427 replica - Page 5 - PeachParts Mercedes-Benz Forum

t walgamuth · #61 02-18-2018, 10:50 AM

Its here now. Very impressive truck, hauls 8. Cummins engine. He has a cummins dodge truck at home in San Antonio.. He's from Moravia next to Ukraine.

sloride · #62 02-18-2018, 03:03 PM

Quote:

Originally Posted by t walgamuth

Its here now. Very impressive truck, hauls 8. Cummins engine. He has a cummins dodge truck at home in San Antonio.. He's from Moravia next to Ukraine.

In the first photograph of it while still on the truck, I can see what looks like the last three letters are UMP on the fuel cell. Would the first two be TR?

Looks great BTW good luck with it, I am sure you are relieved now.

P.C. · #63 02-18-2018, 06:40 PM

ATL, not UMP...

t walgamuth · #64 02-18-2018, 07:51 PM

So I just measured the
WB and it is 90".

the unit which holds the brake, clutch and gas pedals is a very rugged aluminum fixture which is three times as strong as anything on my Forumula Ford or Lotus 7.

I also discovered that while it does not have any insulation on the inside of the wheel wells it does on the outside, lucky it does as there is only about a half inch between the exhaust header and the wheel well. Yikes!

I looked at the open tubes which are situated to accept a steel tube to form a roll bar. They are nearly 3/16" wall thickness and have an ID of 1 15/16".

t walgamuth · #65 02-23-2018, 12:55 PM

Total weight with half a tank of gas 2083#. F/R 50/50. Cross weights pretty much perfect. With me in the car its a little heavy on the left. with two its a little heavy on the
right and it would no doubt be a little more heavy in the rear.

t walgamuth · #66 02-24-2018, 07:02 PM

Today returned the scales to Plainfield and verified that there is a limited slip in the rear.

t walgamuth · #67 02-26-2018, 03:03 PM

Its sunny and warmish today. I'm heading back to the house to see if I can fire up the snake and cruise Lafayette.

t walgamuth · #68 02-26-2018, 06:14 PM

Well, its a handful. It's not really running right and when the carbs clear it lights up both tires. Also there seems to be some torque induced steering, which is a little unsettling. The PO had the chassis adjusted to give an inch more ground clearance. I am wondering if some of my links need adjusting now to compensate.

It seems to possibly be running rich on the idle circuite and lean on the primary circuits. If I let it rev to 3000 it pops and backfires through the pipes.

Not very relaxing to drive. It looks great though and casual observers I hope missed my grim concentration.
__________________

t walgamuth · #69 03-13-2018, 09:01 PM

My research has revealed that the cam in the engine is totally wrong for the weber carbs. The webers require minimal overlap about 225 and a small angle between lobes (whatever that means) to function correctly. they also require a lot of spark advance, 18 btdc at idle and 38 at high rpm.

I have ordered air cleaners for the carbs and two kirkey racing seats. That all is here now. I'll be taking it out to my Indie's and we'll set the advance as it should be and see what happens.

t walgamuth · #70 03-26-2018, 08:18 PM

I ordered the new cam today. I will remove the carbs and intake manifold and ship them to the carb specialist Jim Inglese who will check them over and jet as needed and adjust floats, etc. so I can bolt them on and they'll be perfect.

t walgamuth · #71 03-31-2018, 11:53 PM

I dropped off the Cobra off at my Indie's and the gal working the desk took the trouble to compliment me on it. She likes the orange paint and really likes the loud exhaust.

Hmmmm.... I'm not used to girls being interested in my cars.

t walgamuth · #72 04-01-2018, 03:13 PM

In looking at the classes I can run in, I have choice:
1. CAMs (classic american muscle, sports car) Must weigh minimum of 2500# so I'd need to add about 400# of ballast to be legal.
2. X Prepared, I'd need to weigh a minimum of 2,460# so only 330# of ballast.
3. E mod, minimum weight would be 1800# me included so I'd be about 400 # too heavy....making serious competitiveness unlikely.

Pick my poison!

I suppose I'll start running CAMs since I only have street tires for the car at the moment.

sloride · #73 04-01-2018, 07:35 PM

Quote:

Originally Posted by t walgamuth

In looking at the classes I can run in, I have choice:
1. CAMs (classic american muscle, sports car) Must weigh minimum of 2500# so I'd need to add about 400# of ballast to be legal.
2. X Prepared, I'd need to weigh a minimum of 2,460# so only 330# of ballast.
3. E mod, minimum weight would be 1800# me included so I'd be about 400 # too heavy....making serious competitiveness unlikely.

Pick my poison!

I suppose I'll start running CAMs since I only have street tires for the car at the moment.

Can you go to wider which would be heavier tires, or other items that usually are lightened. I mean going with larger brake calipers and rotors as long as you need to pick up weight anyway?

t walgamuth · #74 04-01-2018, 11:51 PM

Its a lot cheaper to buy large chunks of steel.

If I decide to run E mod then I'll want to be lighter. Lighter always seems better in a race car.

t walgamuth · #75 04-04-2018, 10:57 AM

I bought an air dam last night.