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Re: Building a "bigger than a big block small block" [Re: ScottSmith_Harms] #250559
03/26/09 09:18 AM
03/26/09 09:18 AM
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I took the car for a ride last night and it really caught me off guard. Night and day over the 408. I'm looking forward to making some passes next Saturday.

When I drove the car with this motor and the 4 speed the throttle was like an on/off burnout switch. With the auto it definately will help hook the car up.

As for the manifold, I did some hand porting & gasket matching but its tough to get in there.

I do have a second manifold that I mounted in a bridgeport and milled away all the runners underneath. The idea is to fabricate a steel single plane runner system on the lower level of the dual plan and braze it in place and contour with epoxy. Granted, its less than ideal and with no testing equipment other than track time after the swap its really shooting from the hip but think I can eliminate some 90 degree bends in the stock dual plane and definately remove some pig iron weight too.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: Building a "bigger than a big block small block" [Re: CJK440] #250560
03/26/09 06:38 PM
03/26/09 06:38 PM
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Chris:

Juat curious, what were the sonic test numbers on your block??

MB

Re: Building a "bigger than a big block small block" [Re: HPMike] #250561
03/27/09 09:46 AM
03/27/09 09:46 AM
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Thats a good question Mike and brings up a sore subject. The shop that originally did the block work checked it and cleared it for a .040" overbore, I thought .040" was safe but they said they would make sure. However just short of completion I ended up hastily pulled the block out and sent it to another shop due to some "disagreements" and never got the actual numbers.

I had a couple of snags when I was first building this thing 3 years ago. Hindsight is 20/20.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: Building a "bigger than a big block small block" [Re: CJK440] #250562
03/27/09 10:37 AM
03/27/09 10:37 AM
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Quote:

Thats a good question Mike and brings up a sore subject. The shop that originally did the block work checked it and cleared it for a .040" overbore, I thought .040" was safe but they said they would make sure. However just short of completion I ended up hastily pulled the block out and sent it to another shop due to some "disagreements" and never got the actual numbers.

I had a couple of snags when I was first building this thing 3 years ago. Hindsight is 20/20.




Keep up the good work.. With the featherlight weight of that car, it might get interesting.



MB

Re: Building a "bigger than a big block small block" [Re: HPMike] #250563
03/27/09 01:38 PM
03/27/09 01:38 PM
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We'll see in a week.

I have a feeling I am going to get a rude awakening in the form of chassis setup as I never had enough power to require chassis tweaks. Previously I'd launch off idle and floor it WOT all the way down the track, got me in the 11's. But I think I'll have to roll onto the throttle and hope 1-2 doesn't hit too hard.

I'm going to bring along some ballast just in case but quite honestly I'm going to be looking for mph on Saturday and work on ET in the future.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: Building a "bigger than a big block small block" [Re: CJK440] #250564
03/27/09 08:10 PM
03/27/09 08:10 PM
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I have no idea how you will get that car to hook with all that torque. Especially in a light car like that I would think it is just going want to spin.

Re: Building a "bigger than a big block small block" [Re: 69Cuda340S] #250565
03/27/09 08:53 PM
03/27/09 08:53 PM
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Quote:

I have no idea how you will get that car to hook with all that torque. Especially in a light car like that I would think it is just going want to spin.




While it does take some practice and a friendly track, they actually hook a bit better than you think. G70 bias ply FAST car.

Re: Building a "bigger than a big block small block" [Re: CJK440] #250566
03/27/09 09:26 PM
03/27/09 09:26 PM
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Quote:

I took the car for a ride last night and it really caught me off guard. Night and day over the 408. I'm looking forward to making some passes next Saturday.

When I drove the car with this motor and the 4 speed the throttle was like an on/off burnout switch. With the auto it definately will help hook the car up.

As for the manifold, I did some hand porting & gasket matching but its tough to get in there.

I do have a second manifold that I mounted in a bridgeport and milled away all the runners underneath. The idea is to fabricate a steel single plane runner system on the lower level of the dual plan and braze it in place and contour with epoxy. Granted, its less than ideal and with no testing equipment other than track time after the swap its really shooting from the hip but think I can eliminate some 90 degree bends in the stock dual plane and definately remove some pig iron weight too.



Any chance you'll share pics of this manifold with the bottom milled out?

Re: Building a "bigger than a big block small block" [Re: FuryUs] #250567
03/28/09 06:29 AM
03/28/09 06:29 AM
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Sure, when I get to it I will, but its more of a long term project right now. Bigger fish to fry at the moment.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: Building a "bigger than a big block small block" [Re: CJK440] #250568
04/04/09 09:45 PM
04/04/09 09:45 PM
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UPDATE:

Ran the sucker at E-town today. It was 1/8th only but still a good event to get used to launching with the extra cubes.

I went to the track with the Thermoquad unchanged from the pumpgas 408 and with the timing backed down to be safe.

First pass of the day blew the tires off and ran a "meh" 7.78 @ 94mph.

It took a few passes to get used to the extra power off the line and to make a few timing adjustments but whittled the ET down and qualified 3rd out of 14 cars with a 7.56.

I ended up moving thru the quick 8, winning my first race and a much faster car red lit in the semi's and I ultimately lost to Ed Cook.

Best pass of the day.... 7.42 @ 96.17.

Looks like a 7.42 is equivalent to an 11.60 or so in the 1/4. Not too shabby for the first time out with no dyno tuning.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: Building a "bigger than a big block small block" [Re: CJK440] #250569
04/04/09 09:59 PM
04/04/09 09:59 PM
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Spokane Washington
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Nnnn-Ice!

Did you try any ballast? If so did you notice any advantage?

Re: Building a "bigger than a big block small block" [Re: ScottSmith_Harms] #250570
04/05/09 05:27 PM
04/05/09 05:27 PM
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Good numbers there. Should pick up some more with break in and some tuning.

Re: Building a "bigger than a big block small block" [Re: 69Cuda340S] #250571
04/06/09 08:40 AM
04/06/09 08:40 AM
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No ballast other than the spare in the trunk. I put 3.73 gears in it over the winter and wished I still had the 4.10's for the 1/8th.

I'm really excited to see how it does on a full pass.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: Building a "bigger than a big block small block" [Re: CJK440] #250572
04/06/09 12:39 PM
04/06/09 12:39 PM
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Spokane Washington
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I just noticed that you are selling the car (in the Moparts A-body FS ads). Bummer! I was hoping to see you ring out the combo a bit more to see it's full potential.

Re: Building a "bigger than a big block small block" [Re: ScottSmith_Harms] #250573
04/06/09 01:32 PM
04/06/09 01:32 PM
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Scott, I'm interested in selling it, it's not sold.

I still plan to see how fast it will go until somebody steps up and takes it.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: Building a "bigger than a big block small block" [Re: CJK440] #250574
04/06/09 05:17 PM
04/06/09 05:17 PM
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The first half of the track is where the tires are hurting your ET. The back half should be a little better.


Getting old just means you were smarter than some and luckier than others.
Re: "Bigger than a big block small block" F.A.S.T./SUPERCAR [Re: CJK440] #250575
04/07/09 12:13 PM
04/07/09 12:13 PM
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Chris, I like the shifter linkage you made, it looks oddly familiar This one's for floor shift though.



I definitely bookmarked that thread on the Supercar forum. It gives me a kick in the behind to get my 5.9 into my Demon! Great job there.

Re: "Bigger than a big block small block" F.A.S.T./SUPERCAR [Re: sharpie] #250576
04/07/09 08:26 PM
04/07/09 08:26 PM
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Quote:

Chris, I like the shifter linkage you made, it looks oddly familiar This one's for floor shift though.







When I started racing this car I put a 4 speed in it. I made all the shift rods out of 1/2 steel rod with ball joints like that on both ends of all three. No slop!!


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: "Bigger than a big block small block" F.A.S.T./SUPERCAR [Re: CJK440] #250577
04/26/09 08:08 AM
04/26/09 08:08 AM
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Well the build paid off and it ran the number I originally built it to run.

I clicked off an 11.49 @ 118mph.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: "Bigger than a big block small block" F.A.S.T./SUPERCAR [Re: CJK440] #250578
04/30/09 09:53 PM
04/30/09 09:53 PM
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Congrats on that time! Those are great numbers for a small block FAST car.

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