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summit blower cam and new pulley

 
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87IrocTim
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PostPosted: Sun Jun 08, 2008 10:11 pm    Post subject: summit blower cam and new pulley Reply with quote

a couple nights ago i ordered a 2.5 inch upper pulley for a weiand 142 compared to the stock 3.08, and the summit brand blower cam with 234/244 duration @.050 and .488/.510 lift, and 114 lobe separation. powerband is 3000-6500. also, there will be more lift then advertised because of the 1.6 rockers.

how much is this pulley going to be upping the boost? i was figuring somewhere around 1-2psi, somewhere around 20-40 horse, and figured the blower cam would help it out to around 10hp. any ideas?

also for the camaro, i run a 224/234 summit cam with .465/.488 lift, and it has a fairly smooth idle, barely noticing any overlap. has anyone else here used that summit camif so hows the idle? i would imagine a little choppy, but not nearly as bad as it is now.

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af2
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1933 Willys Coupe

PostPosted: Sun Jun 08, 2008 10:23 pm    Post subject: Reply with quote

At 224 it will be tame! I would go more but until you know the boost start on the low side. Look at overlap when choosing the cam!
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87IrocTim
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PostPosted: Sun Jun 08, 2008 10:43 pm    Post subject: Reply with quote

no the 224 cam is on the camaro. the nova is getting the 234/244 @.050 with .488/.510 lift, but it will be a little higher with 1.6's.
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Big Dave
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PostPosted: Wed Jun 11, 2008 4:08 pm    Post subject: Reply with quote

What kind of boost are you measuring with your vacuum boost gauge now?

The boost is linear up until the belt slips. In other words take what ever amount of boost you have now for any RPM and multiply that number by 1.23 to find out how much your boost went up. Your horse power will not rise as fast because you are pumping in more heat as well; which dilutes the incoming charge, and delivering less power.

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96capriceMGR
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PostPosted: Wed Jun 11, 2008 5:59 pm    Post subject: Reply with quote

I am going to defy "common knowledge" here and tell you that the 114lsa is very unnecessary. Few years ago I was under the popular belief that blowers needed wide LSAs but today I understand that 112 is already extremely wide and that blowers do not need wider LSAs neither to the nitrous shots guys run in stree/strip cars.

http://www.babcox.com/editorial/ar/eb90252.htm
Not blower specific but will give you some idea just how poorly off the shelf cams are spec'd and maybe more importantly WHY.
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87IrocTim
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PostPosted: Thu Jun 12, 2008 10:20 pm    Post subject: Reply with quote

do you recommend i leave the cam straight up, or set it 4 degrees advanced. if the manufacturer already has the cam 4 degrees advanced when its straight up, then would it just be safest installing the timing chain straight up? well what i do know is the summit cam in the camaro runs great and makes good mid range, so theres no reason i shouldnt be happy with this one.

basically how can i set this all up to work well with itself?

by the way, im figuring its jsut the spark plugs or distributor cap or some ignition issue, but at high rpm whether im flooring it or holding it high, it skips and stutteres. ignition issue? fuel filter? any ideas so i can knock it out as im installing the new cam?

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TSHACK
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PostPosted: Fri Jun 13, 2008 2:50 am    Post subject: Reply with quote

Don't forget to check the plug cables I've damaged more than a few when running the valve lash or something on the top. Embarassed
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wagon train
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PostPosted: Fri Jun 13, 2008 8:25 pm    Post subject: Reply with quote

Sounds like valve float.When you add boost to the back of the valve it effectively lowers the spring pressure.you can figure the loss by figuring out the area and adding boost pressure and come up with how much spring pressure loss you have.
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87IrocTim
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PostPosted: Sun Jun 15, 2008 10:22 pm    Post subject: Reply with quote

hey ended up being cylinder number 6spark plug wire. it arced out on the header and then the plug loaded up. got a new distributor cap coil, rotor, plugs, and wires, runs like a champ

also, today was the day i put my summit cam in. broke in perfect. idle is similar to before, just not as choppy, and has really good throttle response. havent drove it around town yet, will be soon.

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Big Dave
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PostPosted: Mon Jun 16, 2008 12:21 pm    Post subject: Reply with quote

So when are you going to udate the picture of your motor? It has not changed in ages and I know you have done a lot of work on it.

Big Dave
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87IrocTim
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PostPosted: Wed Jun 18, 2008 4:30 pm    Post subject: Reply with quote

true i guess ive been a bit lazy. ok ill get it done now.
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87IrocTim
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PostPosted: Wed Jun 18, 2008 4:34 pm    Post subject: Reply with quote

well i cant resize it for some reason. my computer sais it needs flash, so i downlaod flash, and it still sais i need flash....
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af2
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PostPosted: Wed Jun 18, 2008 4:49 pm    Post subject: Reply with quote

Tim, get those bars snugged to the leaf springs!
Adjust from there! Shocked
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jimmoffitt
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1932 Austin Maxi

PostPosted: Wed Jun 18, 2008 7:51 pm    Post subject: Reply with quote

96capriceMGR wrote:
I am going to defy "common knowledge" here and tell you that the 114lsa is very unnecessary. Few years ago I was under the popular belief that blowers needed wide LSAs but today I understand that 112 is already extremely wide and that blowers do not need wider LSAs neither to the nitrous shots guys run in stree/strip cars.

http://www.babcox.com/editorial/ar/eb90252.htm
Not blower specific but will give you some idea just how poorly off the shelf cams are spec'd and maybe more importantly WHY.

im with you 100% on that ive actualy dropped back to a 106 from a 112 and the car performs much better. im makeing better than 900 horses with a 200 shot and its real smooth
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