He offered to do that but I was not ready to do any tuning. It was more of an assessment. Next time we will do tuning at the dyno.
When good is not enough, Camshaft time again.
- Thread starter Kent mosby
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TT5.9mag
Two atmospheres are better than one
So how many pulls did you guys make with no tuning?
TT5.9mag
Two atmospheres are better than one
The difference in power between 10 runs on a dyno could be HUGE when you’re actually tuning it. Maybe there’s no reason for you to be disappointed just yet. For instance, the twin turbo BBC I built for my boat on the first pull made 545hp. After 20 pulls (running timing sweeps and lash loops, as well as carb adjustments and boost) we were knocking on 900 hp. That’s a different animal because of boost but I could definitely see a difference of 80-100hp in tuning a healthy NA fuel injected big block between first and last runs.
Just 3 runs. I was mostly just curious where we were. We had not even been down the track yet.
Do it up and get to testing. ET is primarily chassis/converter based fixes, MPH is HP to the ground.
Have fun with it is most important
Have fun with it is most important
PRH
Well-Known Member
Where was the cam installed for the dyno pulls?
Retarded 8 degrees
PRH
Well-Known Member
So, like 116 intake c/l?
Correct, I had to go back and read my thread on degreeing my cam.
PRH
Well-Known Member
What ratio rockers were on the engine for the dyno?
Slightly bigger cam, installed correctly…….. should pump up the dyno numbers.
Slightly bigger cam, installed correctly…….. should pump up the dyno numbers.
OMG man, how did u come up with 8* retarded? And why. I can’t think of a logical reason for doing that. I would have scrapped that cam and gotten the right cam. There is your biggest problem. I bet u lost 50-80 hp there alone. Plus being at least straight up it will run a lot better and be more responsive. No wonders your FI doesn’t work right. Kim
Well, I thought I had everything ready to begin the install. Then I went to install the cam and it would not fit into the existing cam bearings. I inspected the bearings with a bore scope and then tried in the old cam and it fit easily so no burrs or dings prevent install. Then I measured the new cam and all the cam journals or “races” are .002-.003 in larger than the old cam. Does anyone have the specs for what the journal sizes are supposed to be? The largest one on the new cam is right at 2.000 inch in the micrometer. Maybe .0005 under. Definitely not .001 under 2 inches. What to do now?
Remind us what cam you have.
From another site I found the bearing sizes. here is a compare of what I have
bearing size ---------- new cam -------- old cam
1 2.00-2.001 ---------- 1.9995 ------ 1.9975
2. 1.984-1.985--------- 1.9835. ------- 1.980
3.1.969-1.970. -------- 1.968. ------ - 1.967
4. 1.953-1.954. --------- 1.952. ------- 1.949
5. 1.750-1.751.---------- 1.749 ------- 1.7475
The bearing size listed is nominal bearing size, I could not measure mine
Runout was less that .0005 on center journal
bearing size ---------- new cam -------- old cam
1 2.00-2.001 ---------- 1.9995 ------ 1.9975
2. 1.984-1.985--------- 1.9835. ------- 1.980
3.1.969-1.970. -------- 1.968. ------ - 1.967
4. 1.953-1.954. --------- 1.952. ------- 1.949
5. 1.750-1.751.---------- 1.749 ------- 1.7475
The bearing size listed is nominal bearing size, I could not measure mine
Runout was less that .0005 on center journal
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We've been preachin on here for years now not to use Comp. Caint say you weren't warned.
Kent, I’ve never had to do this but a couple of my buddies have chucked a few cams in their laithes and took a few thou off the too big journals. Kim
That's not what Jim and Duane said, I believe they both use comp.
I remember Jim saying he never had a failure with Comp.
Dwayne is arranging a fix for it. I have until spring to get this back together, so no hurry. My machining days are behind me. No more machines to use.
They can have at it.
mopowers
Well-Known Member
Are you sure the cam is straight? That's easy to check and fix.
Maybe so, but he shouldn't have to.
mopowers
Well-Known Member
Maybe, but I can't remember the last straight one I've bought and I've had cams from Lunati, Delta, Howards, Comp, Schneider, Mopar (maybe more). Who knows - maybe the delivery boneheads have something to do with that. The Lunati cam in my old duster 25-ish yrs ago was 15 thou out. That's when I started checking it. Takes about 5-10 mins to fix, so I just fix it and don't really worry about it.
I'd send them sumbitches right on back too. I've had several reground and never had not one single problem. Oregon is my huckleberry from now on.
BSB67
Well-Known Member
Answered in post 215.
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