Tuning a methanol motor . Help I'm heading to the Dyno

After a year of gathering new parts I'm ready to head back to the Dyno and sort out the bugs in my new engine. I'm running on methanol and I'm not sure the best way to go about tuning it? The Dyno opperater said we can tune to a target A/F ratio or to a target egt. I've always heard lean is mean, but is there a threshold I need to lookout for on egt? I'm going into this a little gunshy as my last engine broke a lifter on the Dyno durring warmup. And Im doing everything in my power to insure this goes well. Here's a little parts list if anyone wants to take a guess

A460 block 4.390 bore
Scat 4340 4.300 crank
Scat 6.800 h beams
Probe flat tops .015 in the hole
278 285 810 lift solid roller
Ported milled A429 heads
14.1 compression
Ported victor intake
1050 alky carb .
2 1/8 headers to 4" collectors

Looks very interesting.
I will take a guess - without knowing anything about the heads or camshaft profile.

770 HP @6600 - 6700 rpm
660 ft lb @ 5200

Tomorrow is the big day. My engine builder said its looking good he did a few small pulls tonight to get a little heat in it and check for leaks. It made 741hp at 5k with zero tuning and timing at 34*. More details to come tomorrow evning.

I'd start out fat with fuel and work my way down. My methanol experience has been with A460 heads but less timing is best, 26-28...good luck!

Keep us posted.
This sounds like a very cool build.
Tell about the cylinder heads - highly modified?
Camshaft - custom?

Cheers

68galaxie wrote:Keep us posted.
This sounds like a very cool build.
Tell about the cylinder heads - highly modified?
Camshaft - custom?

Cheers

The heads have some time porting in them and u shrouding the valves. Their still 2.25 valve. It is a custom ground camshaft, but nothing wild or exotic. This motor goes in my bracket racer mustang. So I still wanted to be easy on valve train parts. I don't remember the exact specs as I oredered the cam almost a year ago.

Most of these parts were ran in my last engine. And went 5.80s @ 119mph in a 2800 lbs car. Upon rebuild we put a little bit more camshaft in it and added a half a point of compression while changing to an A460 block. I'm also adding a vacuum pump this go around. I was hoping for 800 hp. We'll see in a couple of hours.

Love to see the results!

My new cam is similar - 278/290 0.454" lobe on a 111 LSA intake installed on 107.

Good Luck!!

Well we made 751 hp at 6700 rpm on a very conservative Dyno With my headers as it sits in the car. The Dyno opperaters headers were worth almost an extra 30hp but there's no way they would work in my fox body. Also we only had the vacuum set at 7" and that was worth 14hp. Any more vacuum and the oil pressure would start to drop. All of the EGTS were between 1220 -1280. And liked 30* of timing. All and all I'm very happy with the results. As a side note he said that his Dyno is a heartbreaker. He's has 3 other customers who bought dyno'd crate engines like Steve Schmidt/ bob panla/ rehr morrison and they measured 50-80hp less on his Dyno. so maybe we left a few numbers on the table

good build!

751 is the new 651

Sounds like a runner

I'll post the Dyno sheets next week when I pickup the motor. I also have almost 2" of manifold vacuum at wide open. I'm sure a larger carb will help that out. But I'll probably go enderlie injection rather then a bigger carb.

fe50stang wrote:I'll post the Dyno sheets next week when I pickup the motor. I also have almost 2" of manifold vacuum at wide open. I'm sure a larger carb will help that out. But I'll probably go enderlie injection rather then a bigger carb.

injection is a good plan,IMO.

I am glad you are happy with the results.
it will be interesting to look at the dyno sheet.
You have said it made 741 hp at 5000 rpm, and 751 hp at 6700.
My "seat of the pants" analysis without seeing the dyno sheet is it wants more exhaust duration.
fantastic low rpm power, but falls off way before it should.
I am sure there are other cam gurus around that could offer insight.

Should be a very fun ride when it is in the car!!

Cheers.

68galaxie wrote:I am glad you are happy with the results.
it will be interesting to look at the dyno sheet.
You have said it made 741 hp at 5000 rpm, and 751 hp at 6700.
My "seat of the pants" analysis without seeing the dyno sheet is it wants more exhaust duration.
fantastic low rpm power, but falls off way before it should.
I am sure there are other cam gurus around that could offer insight.

Should be a very fun ride when it is in the car!!

Cheers.

I lost almost 30 HP changing to my headers over the Dyno headers. After that I had some ground to make up

fe50stang wrote:I'll post the Dyno sheets next week when I pickup the motor. I also have almost 2" of manifold vacuum at wide open. I'm sure a larger carb will help that out. But I'll probably go enderlie injection rather then a bigger carb.

I ran alky carb before going to the tolit haven't ran it yet at the track but have took it down the road it has a lot more responsive than the carb.