So the cam is in.... - Chevelle Tech
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post #1 of 52 (permalink) Old Sep 17th, 19, 11:10 PM Thread Starter
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Bill
 
Join Date: Dec 2000
Location: Kirksville Mo.
Posts: 574
So the cam is in....

I finally picked out a new cam for the 540. I decided to go with a cam I knew would work. I went with a Lunati Voodoo HR, 231/239 @ .050, 600/600 110LSA. I ordered it on a billet Gen 6 core with everwear gear option. It's the same grind cam that I got from Harold years ago for my 468. My 468 always ran good with it.

I drove the car tonight and it runs good! Runs real nice at low speed, idles at 15 in vacuum and seems fine in overdrive and pulls hard to 6200! It was a little hard to get a full idea of it because my carb needs quite a bit of work.

So here is where I am at now.. I have the MSD distributor set up with the black bushing, 1 heavy spring and 1 blue (light) spring. I have 18* initial 36 total with an additional 10* from the adjustable vacuum advance can hooked up to full vacuum. Yes, the curve is conservative with the 1 heavy and 1 light spring but I'm concerned about spark knock due to high cylinder pressure with that smaller cam. I can always change it later but first I want to get the carb in the ball park.

The carb is a Q series Quick Fuel 950. I just pulled it off and am putting it back to it's original specs as a starting point. I put the original 78-86 main jets back in as well as the 70 IAB and 32HSB. I did leave the 6.5 PV instead of putting the 4.5 back in. Years ago I lowered the IFR's so I will leave that mod and I am thinking about going with .035 for the size of the IFR's. I had also drilled the main body for TSR's but I put the original number 64 drill size back in but at least they are now tapped so it will be easy to change them if needed.

I don't want to turn this thread into a "what I could have done to make the other cams work" thing. I am happy with this new cam, I just need to fine tune it now. If anyone has any suggestions or experience with the QF 950 on the carb tuning feel free to comment. I will report back once the carb is back on and I drive it.

Here is a short idle clip, https://youtu.be/3ARpiTASa0s


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540 BB
10 to 4 comp.
Brodix Race Rite BB-2 Plus heads
Edelbrock RPM Air Gap
Quick Fuel 950 CFM Carb
Lunati Voodoo HR 231/239 @ .050, 600/600, 110 LSA
Johnson 2116 BBR lifters
Hooker Super Comp 2" primary headers
Tremec TKO 600 .82 overdrive
3.73 Posi

Last edited by William Hennke; Sep 17th, 19 at 11:39 PM.
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post #2 of 52 (permalink) Old Sep 17th, 19, 11:22 PM
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Glad to hear you got it in! Is it what you were wanting and expected? I'm still wanting a smaller cam just to make the car a little more comfortable but don't feel it's absolutely necessary now
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post #3 of 52 (permalink) Old Sep 17th, 19, 11:34 PM Thread Starter
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Bill
 
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Re: So the cam is in....

Quote:
Originally Posted by tacomatrd View Post
Glad to hear you got it in! Is it what you were wanting and expected? I'm still wanting a smaller cam just to make the car a little more comfortable but don't feel it's absolutely necessary now
It's a lot nicer in town, like when you turn a corner and accelerate it doesn't buck so bad now. Pulls away from a stop without any fuss too. Drives way better in overdrive, however my carb is so far out I have some dead spots and erratic wideband readings. So I'm starting over with that. I will keep checking in with reports as I get it tuned and then I will be able to give a more accurate description of how it runs over all.


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540 BB
10 to 4 comp.
Brodix Race Rite BB-2 Plus heads
Edelbrock RPM Air Gap
Quick Fuel 950 CFM Carb
Lunati Voodoo HR 231/239 @ .050, 600/600, 110 LSA
Johnson 2116 BBR lifters
Hooker Super Comp 2" primary headers
Tremec TKO 600 .82 overdrive
3.73 Posi
William Hennke is offline  
 
post #4 of 52 (permalink) Old Sep 18th, 19, 3:18 AM
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Chris
 
Join Date: Feb 2006
Location: Lincoln pk NJ
Posts: 3,410
Re: So the cam is in....

Glad the new cam is what you wanted!
Sounds great too!.
Beautiful car!
Good move going back to factory specs on the carb.
I would go bigger on the pv.
Are the O2's in good shape?
Only thinking of this because of the bigger cam "could" have got them pretty covered up.

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #5 of 52 (permalink) Old Sep 18th, 19, 6:37 AM
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Re: So the cam is in....

Sounds very docile. 15" is good to have too especially with a power brake car. I am looking for a cam for my 496 build to achieve the same goals. My car now has a 468 with an unknown solid roller and the brakes are bad. 10" is the best I could get out of it.
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post #6 of 52 (permalink) Old Sep 18th, 19, 8:04 AM Thread Starter
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Bill
 
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Location: Kirksville Mo.
Posts: 574
Re: So the cam is in....

Good question on the 02 sensor.. It seems to be reading ok but once I get the carb closer I should be able to tell. The carb is way off as I had tried some funky stuff with the bleeds and jets to try to smooth it out with the bigger cam. I finally took it off and put my 770 SA on and it ran smoother with it, I suppose because the smaller venturi's worked better at lower rpm.


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540 BB
10 to 4 comp.
Brodix Race Rite BB-2 Plus heads
Edelbrock RPM Air Gap
Quick Fuel 950 CFM Carb
Lunati Voodoo HR 231/239 @ .050, 600/600, 110 LSA
Johnson 2116 BBR lifters
Hooker Super Comp 2" primary headers
Tremec TKO 600 .82 overdrive
3.73 Posi
William Hennke is offline  
post #7 of 52 (permalink) Old Sep 18th, 19, 8:41 AM
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rick
 
Join Date: Jul 2012
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Garage
Re: So the cam is in....

If that's cam #20010722 it's the one I've been eye balling for a while now but wasn't sure it would be enough for my 10.77:1 489, I'm sold, it sounds really good in your 540 and have been reading you weren't happy with some other cams, glad you finally found what you were looking for , on a side note one of my customers has that cam in a 550 hp 468 in a 76 vette but with very noisey lifters (until it warms up), came as a kit from Lunatti and I'm sure they're Morel, I'll be using Howards max effort (Gatorman)


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post #8 of 52 (permalink) Old Sep 18th, 19, 8:55 AM Thread Starter
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Bill
 
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Re: So the cam is in....

Quote:
Originally Posted by shovelrick View Post
If that's cam #20010722 it's the one I've been eye balling for a while now but wasn't sure it would be enough for my 10.77:1 489, I'm sold, it sounds really good in your 540 and have been reading you weren't happy with some other cams, glad you finally found what you were looking for , on a side note one of my customers has that cam in a 550 hp 468 in a 76 vette but with very noisey lifters (until it warms up), came as a kit from Lunatti and I'm sure they're Morel, I'll be using Howards max effort (Gatorman)
Yes, that's the cam. I am running Johnson 2116 BBR lifters. They run quiet and no problem with RPM in my application.
OLDED, WHT/73 and shovelrick like this.


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540 BB
10 to 4 comp.
Brodix Race Rite BB-2 Plus heads
Edelbrock RPM Air Gap
Quick Fuel 950 CFM Carb
Lunati Voodoo HR 231/239 @ .050, 600/600, 110 LSA
Johnson 2116 BBR lifters
Hooker Super Comp 2" primary headers
Tremec TKO 600 .82 overdrive
3.73 Posi
William Hennke is offline  
post #9 of 52 (permalink) Old Sep 19th, 19, 12:20 AM
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Re: So the cam is in....

What’s the idle RPM where it makes 15” vacuum?
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post #10 of 52 (permalink) Old Sep 19th, 19, 7:03 AM
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Gene
 
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Re: So the cam is in....

Bill, does the vacuum advance have the scroll to limit degrees? Cant compare to my 427 really, but it needed to be limited to 6 degrees vac adv or else it would rattle a bit on the open road.

Gene
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post #11 of 52 (permalink) Old Sep 19th, 19, 8:02 AM Thread Starter
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Bill
 
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Re: So the cam is in....

Quote:
Originally Posted by Roadknee View Post
What’s the idle RPM where it makes 15” vacuum?
It was idling at 850.
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540 BB
10 to 4 comp.
Brodix Race Rite BB-2 Plus heads
Edelbrock RPM Air Gap
Quick Fuel 950 CFM Carb
Lunati Voodoo HR 231/239 @ .050, 600/600, 110 LSA
Johnson 2116 BBR lifters
Hooker Super Comp 2" primary headers
Tremec TKO 600 .82 overdrive
3.73 Posi
William Hennke is offline  
post #12 of 52 (permalink) Old Sep 19th, 19, 8:09 AM Thread Starter
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Bill
 
Join Date: Dec 2000
Location: Kirksville Mo.
Posts: 574
Re: So the cam is in....

Quote:
Originally Posted by 427L88 View Post
Bill, does the vacuum advance have the scroll to limit degrees? Cant compare to my 427 really, but it needed to be limited to 6 degrees vac adv or else it would rattle a bit on the open road.
Yes, I can limit degrees. It's a good possibility you may be correct. That is one reason I am running the 1 heavy and 1 light spring on the centrifugal advance. I think with that smaller cam the cylinder pressure could be an issue. I didn't get to work on it last night so will try to get carb back together tonight and drive it some. Once I get the carb in the ball park I will try the lighter springs and limit vacuum advance more if needed.


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540 BB
10 to 4 comp.
Brodix Race Rite BB-2 Plus heads
Edelbrock RPM Air Gap
Quick Fuel 950 CFM Carb
Lunati Voodoo HR 231/239 @ .050, 600/600, 110 LSA
Johnson 2116 BBR lifters
Hooker Super Comp 2" primary headers
Tremec TKO 600 .82 overdrive
3.73 Posi
William Hennke is offline  
post #13 of 52 (permalink) Old Sep 19th, 19, 3:24 PM
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Gene
 
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Posts: 14,232
Re: So the cam is in....

Dave Ray is big on limiting the vac on performance engines. So blame Dave.

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
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post #14 of 52 (permalink) Old Sep 19th, 19, 8:20 PM Thread Starter
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Bill
 
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Location: Kirksville Mo.
Posts: 574
Re: So the cam is in....

Ok, so I drove the car today and that QF 950 even with 35 IFR's and 70 IAB wanted to have a bad lean spot in it at steady cruise around 1800 RPM. I just don't have the time to mess with it so I put my old 770SA on it. It has the IAB and MAB tapped but I put the original size 26 MAB and 77 IAB back in it and a 72 jet in the front. The IFR is the stock size, I think .035. I am running a 6.5 PV in it. It's bad rich, off of idle. At idle I had it around 14.7 but as RPM's go up it just goes rich clear down to low 12's on my AFR gauge. At 70 (around 2800 RPM) it's right at 12. Float levels are fine and PV is ok so I need to figure out what to change to fix that. I hate to drill out and tap the IFR as it's already down low on this carb. I am already at 77 on the IAB but at 2800 I should be on the main jet. If I remember correctly I tried to lean it out when the other cam was in it and it just surged worse. Right now total timing is around 36-38 at 2800. I did try changing the advance springs to the 1 lighter silver spring and left the 1 heavy spring. That should have brought the timing in a little quicker but no change in the fueling. I pulled a plug and they are a dark tan verifying the WB gauge.


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540 BB
10 to 4 comp.
Brodix Race Rite BB-2 Plus heads
Edelbrock RPM Air Gap
Quick Fuel 950 CFM Carb
Lunati Voodoo HR 231/239 @ .050, 600/600, 110 LSA
Johnson 2116 BBR lifters
Hooker Super Comp 2" primary headers
Tremec TKO 600 .82 overdrive
3.73 Posi
William Hennke is offline  
post #15 of 52 (permalink) Old Sep 19th, 19, 9:01 PM
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Kerry
 
Join Date: Feb 2013
Location: Lloydminster, Alberta
Posts: 861
Re: So the cam is in....

Here's a set up I did in a friends Q950 which came from jmarkaudio. Worked great on his 499 RB stroker. Picked up 2 tenths and 2 mph in the 1/4. Runs so much crisper at idle and off idle, when coming back down the return road and around the pits.
IFR to low position in the blocks at .035".
Emulsion changed to top-bottom open/closed/open/closed, as delivered orifice sizes for the open ones.
transfer slot restrictors in main body of primary and secondary of .082"
6.5 PV
Pink 1-1 cams Pri/sec
35/35 squirters
idle air bleed 70
High speed air bleed 28
Mains 76/84.

For the 770 street avenger,
IFR .033/.035 Primary/sec (.033/.031 as delivered)
Idle air bleeds 70/70 pri/sec (74/26 as delivered)
High speed bleeds 26/24 pri/sec
69/80 jets
secondary vacuum signal tube
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