boost question
#11
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Re: boost question
Originally Posted by Wildchild212
#1 I have a 525sc all of the components of an sc, would like to know the pulley size.
Originally Posted by Wildchild212
#3 yes the gauge was hooked up in the right spot. could have been a fitting problem,
Originally Posted by Wildchild212
#4 no the motors hp did not jump around, ran great,
Originally Posted by Wildchild212
#5 I stated 2 to 3 lbs of boost, I would say that is positive, if it would have been negative I would have called that vacuum,
Originally Posted by Wildchild212
#6 sutphen, The dyno was at dts dyno. these where just some questions I came up with at night, not at the dyno room,
Originally Posted by Wildchild212
#7The belt is a sepentine belt,
Originally Posted by Wildchild212
Mc I was just asking a few questions, Sorry if my questions were not up to your standards,
And there was nothing wrong with your questions, you simply asked questions with no supporting info or basis from which to answer. If I just wanted to rain on your world, I would have done so. But since I want to try to help answer your (good but poorly supported) questions, I told you what info you had omitted. I also threw in some daggers cause I am probably not as tolerant as I could be.
Originally Posted by Wildchild212
Dayum MC! Are we getting a little grumpy in our old age?!?
mc
Last edited by mcollinstn; 03-07-2005 at 08:46 PM.
#13
Re: boost question
[QUOTE=Wildchild212]#1 I have a 525sc all of the components of an sc, would like to know the pulley size.
QUOTE]
I did a search and came up with 5.5" as stock? Those that were looking for more boost were running 2.5"-3.0", but recommended an intercooler.
Bruce
QUOTE]
I did a search and came up with 5.5" as stock? Those that were looking for more boost were running 2.5"-3.0", but recommended an intercooler.
Bruce
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Re: boost question
Originally Posted by Griff
5.5 lbs of boost is stock.
Top pulley is 3.5" and Bottom pulley is 7.0" stock on 525sc
A 3.0" top pulley will give about 7 lbs of boost.
Top pulley is 3.5" and Bottom pulley is 7.0" stock on 525sc
A 3.0" top pulley will give about 7 lbs of boost.
Griff, Do you know off hand what the belt size is? Obviously my belt is to small for the 7.0 pulley.
Mark.
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Re: boost question
My dyno info is on a floppy disk and my computers floppy drive does not work. However here are the specs of the motor from top to bottom.
stock 525sc flame arrestor. 1050 dominator carb running 93 jets square . a 177 weiand blower w? a 3.5 pulley on top and a 7.0 pulley on crank.( was running wrong pulley @dyno time. pulley was a 4.75) rectangle port heads with 1.900 standard length inconel exhaust valves. 2.190 severe duty intake valves. Crane cam, lift intake @ cam 312 @valve 530 exhaust @cam 324 @ valve 551. cam timing @.005 intake open 5* btdc closes 43* abdc max lift 109 duration 228* exhaust opens 57* bbdc closes 1* btdc duration 236* Ground w? a 112 center lobe. piston are 8-1 compression w/ 4.28 bore. felpro gaskets all the way around and a high volume oil pump.
stock 525sc flame arrestor. 1050 dominator carb running 93 jets square . a 177 weiand blower w? a 3.5 pulley on top and a 7.0 pulley on crank.( was running wrong pulley @dyno time. pulley was a 4.75) rectangle port heads with 1.900 standard length inconel exhaust valves. 2.190 severe duty intake valves. Crane cam, lift intake @ cam 312 @valve 530 exhaust @cam 324 @ valve 551. cam timing @.005 intake open 5* btdc closes 43* abdc max lift 109 duration 228* exhaust opens 57* bbdc closes 1* btdc duration 236* Ground w? a 112 center lobe. piston are 8-1 compression w/ 4.28 bore. felpro gaskets all the way around and a high volume oil pump.
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Re: boost question
Originally Posted by Thirsty Turtle
They should give you a free pull for the mix-up on the pulley size
#19
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Re: boost question
That would definately expalin the low boost reading. They were probably correct.
The specs you posted were almost identical to a 525sc. Is your cam a custom grind on the 112 lobe sep???? All the #'s are the same as the 525sc cam except for that. Stock crane cam is 114 lob sep???
Carb jetting is also on the lean side. Stock jetting is 98's squared. I would go bigger if I were you. Nothing will kill a blower engine faster than being lean.
Other than that, the only differences I see are the .030 overbore and the CR you listed is 8:1. Stock is 7.5:1. Both will only add power. If thre Cr really is 8:1, then you mightwant to keep timing down to 32* Stock is 35*
You should have a solid 525-535hp engine.
The specs you posted were almost identical to a 525sc. Is your cam a custom grind on the 112 lobe sep???? All the #'s are the same as the 525sc cam except for that. Stock crane cam is 114 lob sep???
Carb jetting is also on the lean side. Stock jetting is 98's squared. I would go bigger if I were you. Nothing will kill a blower engine faster than being lean.
Other than that, the only differences I see are the .030 overbore and the CR you listed is 8:1. Stock is 7.5:1. Both will only add power. If thre Cr really is 8:1, then you mightwant to keep timing down to 32* Stock is 35*
You should have a solid 525-535hp engine.
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Re: boost question
Griff. Yes, the cam was ground to a 112. The dyno was telling us that the motor was running rich, that is why I re jetted. That however was with the smaller pulley. I will put the larger jets in now. I set the timing at 32* total for the higher compression. Thank you for all of your help.
Mark
Mark