Somebody had their 446 dynoed again.....
#3
No major improvements so far.
He's got the carb dialed in better than the Edelbrock for sure. But the HP only improved to 271. I have not seen the graphs. Torque has not improved at all from what he told me.
I've got some chatter, best guess is it's valve float, but it's happening at less than 5000RPM. So, he's going to look into the valve train geometry, valve seal to clip clearance and other clearance issues to make sure that's not the problem. If it's not any clearance issues, then it's probably inadequate spring pressure. That's frustrating, since I'm using Crane's reccomended springs, retainers and clips.
As I stated in some of the other threads, he's not too dissapointed with the numbers. He said I'm already putting more torque to the ground than his 514 CI , FI 460 stroker with a C6 and dana 60 (he's also got a transfer case robbing power). Assuming about a 30% loss, I'm near 385HP and 520 torque at the crank. Not too bad....
I wish we had some other RWHP and RWT numbers for similar trucks.
I should have some more graphs and information tomorrow, since I'm off work.
He's got the carb dialed in better than the Edelbrock for sure. But the HP only improved to 271. I have not seen the graphs. Torque has not improved at all from what he told me.
I've got some chatter, best guess is it's valve float, but it's happening at less than 5000RPM. So, he's going to look into the valve train geometry, valve seal to clip clearance and other clearance issues to make sure that's not the problem. If it's not any clearance issues, then it's probably inadequate spring pressure. That's frustrating, since I'm using Crane's reccomended springs, retainers and clips.
As I stated in some of the other threads, he's not too dissapointed with the numbers. He said I'm already putting more torque to the ground than his 514 CI , FI 460 stroker with a C6 and dana 60 (he's also got a transfer case robbing power). Assuming about a 30% loss, I'm near 385HP and 520 torque at the crank. Not too bad....
I wish we had some other RWHP and RWT numbers for similar trucks.
I should have some more graphs and information tomorrow, since I'm off work.
Last edited by gtex; 01-07-2004 at 04:58 PM.
#5
#6
If it weren't for baaad luck I'd haaave no luck at aaallll....
Tough to offer possible solutions without knowing more about the "chatter". But it seems that this is real similar to the RPM range you fell off at with the other carb.
Did the chatter exist with the other carb?
Are the float bowls staying full during the run?
Has the dyno guy advanced/retarded the dist to see if it has an effect?
You may want to pull a spring and see if it matches the Crane specs on installed/compressed pressure.
Which springs/bump stop are you using in your dist?
Call Crane and verify the springs.
-Scouder
Tough to offer possible solutions without knowing more about the "chatter". But it seems that this is real similar to the RPM range you fell off at with the other carb.
Did the chatter exist with the other carb?
Are the float bowls staying full during the run?
Has the dyno guy advanced/retarded the dist to see if it has an effect?
You may want to pull a spring and see if it matches the Crane specs on installed/compressed pressure.
Which springs/bump stop are you using in your dist?
Call Crane and verify the springs.
-Scouder
#7
Good points Scouder. Greg, Mr. gasket makes timing tape for like 6 bucks that wraps around your balancer. I just bought some as I was tired of guessing where 40 was. The springs for the roller cam will be much heavier than the hyd so if you have the wrong ones then you will have problems.
What kind of fuel pump are you running again?
What kind of fuel pump are you running again?
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#8
You guys are falling right in behind Steve, the guy working on it.
He called me back, and suggested stiffer springs and a better fuel pump. Although these are the Crane reccomended springs, they are showing to be weak. He's going to upgrade me to some Comp Springs. Fortuntely, there were no other clearance issues observed.
I'm running a stock FE fuel pump. I'm now in the market for an upgraded mechanical or an electric pump. Any suggestions?
He called me back, and suggested stiffer springs and a better fuel pump. Although these are the Crane reccomended springs, they are showing to be weak. He's going to upgrade me to some Comp Springs. Fortuntely, there were no other clearance issues observed.
I'm running a stock FE fuel pump. I'm now in the market for an upgraded mechanical or an electric pump. Any suggestions?
#9
Originally posted by Scouder
If it weren't for baaad luck I'd haaave no luck at aaallll....
Tough to offer possible solutions without knowing more about the "chatter". But it seems that this is real similar to the RPM range you fell off at with the other carb.
Did the chatter exist with the other carb?
Not that I noticed, but I think the other carbs A/F ratio fell apart before the chatter was as apparent as it is with the BG carb.
Are the float bowls staying full during the run?
he noted that there was a lot of filling happening just after stomping on it. Sounds like the pump was working hard.
Has the dyno guy advanced/retarded the dist to see if it has an
effect?
No, I told him I felt pretty good about the timing. We'll jigger with that when the other problems are resolved. It's in the mid 30s at full advance.
You may want to pull a spring and see if it matches the Crane specs on installed/compressed pressure.
he measured it and said it was inadequate, like 105lbs seat pressure. I Don't recall the open pressure. His commenst were, this isn't enough for .607 lift. period.
Which springs/bump stop are you using in your dist?
can't recall the colors. But it's a rapid ramp with about a 20 Deg stop bushing. It seems good with an initial in the middile teens (14-18)BTC.
Call Crane and verify the springs.
DId this, crane tech said I had the right springs. Although I never felt good with the distinction, is this a hyd/mech or a a roller. Cause, it's really both, right?
-Scouder
If it weren't for baaad luck I'd haaave no luck at aaallll....
Tough to offer possible solutions without knowing more about the "chatter". But it seems that this is real similar to the RPM range you fell off at with the other carb.
Did the chatter exist with the other carb?
Not that I noticed, but I think the other carbs A/F ratio fell apart before the chatter was as apparent as it is with the BG carb.
Are the float bowls staying full during the run?
he noted that there was a lot of filling happening just after stomping on it. Sounds like the pump was working hard.
Has the dyno guy advanced/retarded the dist to see if it has an
effect?
No, I told him I felt pretty good about the timing. We'll jigger with that when the other problems are resolved. It's in the mid 30s at full advance.
You may want to pull a spring and see if it matches the Crane specs on installed/compressed pressure.
he measured it and said it was inadequate, like 105lbs seat pressure. I Don't recall the open pressure. His commenst were, this isn't enough for .607 lift. period.
Which springs/bump stop are you using in your dist?
can't recall the colors. But it's a rapid ramp with about a 20 Deg stop bushing. It seems good with an initial in the middile teens (14-18)BTC.
Call Crane and verify the springs.
DId this, crane tech said I had the right springs. Although I never felt good with the distinction, is this a hyd/mech or a a roller. Cause, it's really both, right?
-Scouder
#10
Originally posted by gtex
You guys are falling right in behind Steve, the guy working on it.
He called me back, and suggested stiffer springs and a better fuel pump. Although these are the Crane reccomended springs, they are showing to be weak. He's going to upgrade me to some Comp Springs. Fortuntely, there were no other clearance issues observed.
I'm running a stock FE fuel pump. I'm now in the market for an upgraded mechanical or an electric pump. Any suggestions?
You guys are falling right in behind Steve, the guy working on it.
He called me back, and suggested stiffer springs and a better fuel pump. Although these are the Crane reccomended springs, they are showing to be weak. He's going to upgrade me to some Comp Springs. Fortuntely, there were no other clearance issues observed.
I'm running a stock FE fuel pump. I'm now in the market for an upgraded mechanical or an electric pump. Any suggestions?
Edit: Roller springs are much heavier than regular hyd flat tappet. The initial opening of the valve is so quick with a roller that a light spring will throw the lifter off of the lobe.
Last edited by Ratsmoker; 01-07-2004 at 07:11 PM.
#12
I will hopefully have some numbers for you soon Greg. Once I get the little things worked out and get a trailer I will be off to the dyno. I sure hope I can muster at least 271RWHP. I'll fall short on torque bigtime though compared to your monster. If you're not making more power than me when we get all our final results then you still have some tweaking to do. You should have the bigger HP numbers.
#13
Do you really think I need 140 GPH? I think Steve was talking like 75GPH! Of course, you guys may know me better and foresee that NOS and supercharger system....:-)
Summit offers there own brand 140GPH electric for $109.95. I like that it only calls for 2 Amps current...not bad.
Most everything else was in the crazy high flow range or around 70-100 GPH.
Summit offers there own brand 140GPH electric for $109.95. I like that it only calls for 2 Amps current...not bad.
Most everything else was in the crazy high flow range or around 70-100 GPH.
#14
I was told that my holley red pump wouldn't feed my engine and its 97GPH. You always want to overdo it here. The flow ratings on the pumps they advertise are free flow ratings. We need between 5-7 PSI. As the pressure goes up the volume goes down. I looked hard at that summit pump. Reliability is key when choosing one. The summit pump may be great, I just don't know. It may take a 140GPH pump to flow 75GPH at 7psi like Steve was wanting. With my temporary 35GPH pump I can only cruise at about 75MPH before it stops pumping the necessary amount.