The new cam has a lot of overlap. I'm seeing somewhere around 5-1/2" of vacuum at idle. Currently I have the base timing at 10°
Idle is spirited at 800 rpm.
Cruise vacuum at 60 mph is sitting around 15" HG.

The lash for Grind 34 is .020" and .020"
Rather than mess with trying to lossen that up, I'm thinking about feeding a bit more spark advance in. Say bring it up to 12°. That will move my mechanical up from 25° to 27°

Thoughts?

I may leave it alone and take a few tools with me to the track. I think it's going to be lazy off the line. Tomorrow I'm going to take my street tires. No slicks. When I have time to play with it, I'll see what it does with the race rubber.

The engine is just turning on for the 1-2 shift. There is a big lag manually shifting it, so I won't be bothering with the launch shift, rather shift 2-3 like normal.

Hopefully it won't rain tomorrow!

CJ

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Part of Tyrde-Browne Racing

I think you'll want at least 12° initial timing and probably closer to 15°. I wouldn't rule out playing with the lash especially since less duration from wider lash will help compensate for the trans is shifting early by lowering the peak torque RPM.

I would run the slicks myself. Hook it up consistently and reduce the variables.

What shift kit is in the trans? If it were Trans-Go TF2 it should shift a little higher. If the shift quality is good then you might play with lighter governor weights.

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Joshua

I may just go out and do a bit of playing with it tonight.

Shift Kit.. Can't think of the name of it. The one everybody hates, strip setup. Blank. Dang. Getting old is terrible.

Anyway, I'll bump the timing a bit too. Takes forever to get the thing to warm up and idle now.

CJ

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OK! Bumped the timing up around 14° base. Runs much nicer now!

I was able to close the throttle plate down enough that it doesn't try to diesel on me.

There is no tight valve miss, so I'm going to leave it alone for now. Once we find out how it runs on the street tires, I will probably be looking for a new set of drag slicks. The 22" M/T's are probably going to be too short.

I need to find a Neon to Turbo to mount the old ones on.

CJ

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Yep, definitely need more initial advance on a big cam like that. I run mine around 15 initial, 28 final.

Lou

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CJ:
[quote]The new cam has a lot of overlap. I'm seeing somewhere around 5-1/2" of vacuum at idle. Currently I have the base timing at 10°
Idle is spirited at 800 rpm.
Cruise vacuum at 60 mph is sitting around 15" HG.

The lash for Grind 34 is .020" and .020"
Rather than mess with trying to lossen that up, I'm thinking about feeding a bit more spark advance in. Say bring it up to 12°. That will move my mechanical up from 25° to 27°

Thoughts?

I may leave it alone and take a few tools with me to the track. I think it's going to be lazy off the line.[/quote]

Has it a good lope?


That thing sounds like my cam… Lazy of the line is a good description, but hang on once past 4000 rpm. My vacuum once past 4400 rpm sits at 18â€￾Hg with steady throttle, and bounces to 23â€￾Hg when throttle plates are closed coasting down from 5500 rpm. I haven’t run it much past 5500 rpm, but previous owner/builder said he shifted at 6300 rpm which I thing is a little on the high side.

After reading Lou, & Josh’s timing comments I may bump up my timing, but will have to limit mechanical advance a bit more to keep it down around 30* +/-.
Bill

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

An interesting day!

Fopar broke on the line, and had to come back out through staging.

The Hooptie did just fine on the street tires, running pretty consistantly in the 15.30's. It would hit the power and acceleration was great. Leaving was a problem. The street tires wouldn't hold it, so Howled them on every launch.

The weather started going south on us, and I lost a tenth, going out first round.

Richard found a welder to repair his broken stuff, and proceded to break-out against his opponent. Both of us were ready to go at that point anyway. Tired, from a night of removing aluminum from the A904 part.

With the drag rubber, I might just put it in the 14's yet. Not sure I have enough gear for the M/T 22" tall slicks I have mounted right now, but I can always give it a shot. Need to do the math for my 3.50 gears to come up with a tire height that puts me in the traps at 5000 rpm.

A good day. Time for some coffee and relaxation.

CJ

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Way back when (really, about 15 years ago), I had a big Isky cam in a slant six, in a truck. I eventually found that since I did not have high compression, it ran best using about 15 to 18 degrees initial advance, and maxed out about 32 degrees total. Running more total didn't seem to hurt the power much, but it made it have way excess blowby. I had a strong idle, but it loped. I also moved the cam up about 6 degrees advanced. Those two things woke up the engine big time and would move the D150 w/3.55 gears and 31 inch tires very well.

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'81 W150 on Propane... Oversize valves, Oregon Camshaft cam, 10:5 static CR, Distributorless ignition, megajolt timing controller, PowerTrax lockers.

Thinking about advancing the cam a bit more. Fopar and I talked about that earlier today. Intake Centerline is ~102.5° right now.
Current compression is 10.7:1 so that really isn't the problem.

Goes like a scalded cat when it hits 4000 rpm. I need to try the shorter tires again. Pretty sure the build will hold 5500 rpm, so may give it a try.



CJ

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Sounds like you guys had quite a day, I definately think short tires and slicks would do it...much like the hpak build once you are over 3500 that cam likes to run...last year I tossed your engine build into Desktop Dyno with a 280/270 with a 108 LSA centerline at 102....numbers looked realllly nice...

Spent my day under the mint duster putting things back together, it's almost there, not sure if I'll have it ready and the mill broke in for Medford...at least the other block came back so I can get the Erson AM build put back together and get the Hpak car back on it's feet.

-D.idiot

Oh, forgot to mention, detonation is back. Will bump back up to Premium pump gas and see what it does. Might have to take a tad of timing back out.
That'll have an effect on vacuum again.

Heck, if I play with the cam advance, I'll be doing that again anyway.

CJ

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Part of Tyrde-Browne Racing

100 deg cam centerline, 27-28 deg max advance, is my recommendation. Thing should run in the 14s...

CJ, you and I are right together again with the Hooptie and Slantkota. We'll see if I can get below my 15.39 best next weekend... It really needs rings and a different cam and it should run in the 14s as well. Still have Bren's 222 deg 110 LSA cam in there at some goofy retarded centerline. Next winter project to get that cleaned up.

Ciao,

Lou

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Thanks folks!

I'll start with narrowing up my advance a couple degrees, leave the base timing where it is, and see how that does.

Detonation occurred out on the freeway at speed mashing it to catch up with Fopar. It's hard to keep up with that old coot sometimes! There is no vacuum advance, and I'm all in mechanical at stall.

While I was at the strip, it never pinged once.

Power drops off above 5000. It comes unhinged at 4000 rpm and builds to 5000 like lightening. I'm going to see if I can find a governor out of a 383 HP as Josh suggested during a phone call. Should bump the shift point where it needs to be. I gutted a governor with Richard this evening, but my lathe is too large to turn the inner weight down. It would be like setting fine jewelry with a crowbar and a five pound sledge hammer.

I was running an open element under the hood today. Conditions wouldn't support using my cold air intake as it doesn't have a filter element. I need to do something about that.
That I was running 15.30's with under hood air, street tires, and experimental first pass tune, the build has some promise! The air was awful. Not the best conditions, and track prep was horrid. This is one of the first events to start putting a base down this year due to all the rain.
Conditions were not ideal.

Best with the RV15M RDP was a 15.02 at Woodburn last year under very good conditions.
That was on drag slicks, but with the old BB Ford Pie Tin on there. It pulled air on the passenger side rear alongside the head. Not optimal, but better than the stack side.

I need to dig that thing out and see if I can get it mounted back up 'till I get a filter set up for the cold air intake. I was running 15.3x at MATS with the cold air intake on the RDP cam and slicks. That's phenomenal compared to previous outings to Vegas.

Hmmmmm. We'll see. Much to test and play with!

CJ

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OK, so you're really about in the 14s already! You know what you're doing and I hope I'm not giving too much advice...

Wonder why power falls above 5000?

Lou

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Cause he won't put a real carb on it I'm guessing.

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