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  #76 (permalink)  
Old 12-25-2012, 11:21 PM
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And certainly fits the trucks cool factor, especially running no hood sides so its all visable....

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  #77 (permalink)  
Old 12-25-2012, 11:22 PM
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Or.....can I get away with the hyper slugs for 230$ from summit.....or is that just asking for trouble? Oh and merry Christmas guys!
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Old 12-25-2012, 11:24 PM
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And last but not least installed straight up is the thumpr going to work with the supercharger? Cause I know they sound dandy, and blower whine on top of that would be very cool....if it actually functiomed how it sounded...
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  #79 (permalink)  
Old 12-25-2012, 11:58 PM
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The thumpr cam is not suitable for this.
Its all wrong for a blower motor.
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  #80 (permalink)  
Old 12-26-2012, 12:11 AM
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But Crane Cam #113841 F-278-2 is suitable and will have plenty of thump.
Lunati 401A3Lun is another good one for this.
The tighter you set the valve lash, the more thump. (effective duration)

Do not go less than a 110 LSA for the blower motor.
The cast dished pistons are fine up to 7psi boost as long as detonation is avoided.
Low engine compression, good gas, easy timing under boost, reasonable blower pulley drive ratio.
6-7psi makes a lot of street power.

The crane cam is just right and the price is right. Needs a stock diameter valve spring swap and pinned rocker studs
on stock heads. If you do a good job porting the 920 heads it will make very impressive power and torque.

Last edited by F-BIRD'88; 12-26-2012 at 12:16 AM.
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  #81 (permalink)  
Old 12-26-2012, 01:02 AM
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Don't really want to rain on anyone's parade ,but F-Bird I see you tell people alot to go blower motor,but I didn't see any that you have run or owned.Just curious...............
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Old 12-26-2012, 01:15 AM
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All the advice you will see me post about these simple blower motor combos are based on either combos I have built or have advised friends here to build. They have all worked really really well. Cars, truck and boats.

Had one friend here , years ago got carried away with high blower boost and timing on stock cast pistons (12psi) and pump gas. Lost a piston when it detonated. He went a lot further than I said he could
reliably and found out why. This is what happens when you exceed the laws of physics.
Not rocket science. Its very hard to beat supercharged street power.

I have a simple low low budget build on the go now based on a stock low cr 305 and the weiand 177 blower with some simple upgrades and mods. It will make well in excess of 430hp on pump gas when its done. Will be using the same Crane F278-2 camshaft in this one.
Its a low 7.2:1 cr so can hit it with quite a bit of boost on pump gas. Ported chevy "920" heads.
Staying within the laws of physics and not getting greedy on boost is the key to reliable supercharged power.

Last edited by F-BIRD'88; 12-26-2012 at 01:39 AM.
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Old 12-26-2012, 08:27 AM
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Fair enough.Thanks for the reply
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  #84 (permalink)  
Old 12-26-2012, 12:23 PM
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.. Yes, Thumpr cams have narrow 107 degree LSA and lots of overlap between intake and exhaust valve opening, allowing a blower to push the air/fuel mixture right through the engine and out the exhaust... the overlap also acts like a serious air leak at lower RPMs in a low compression engine... causing low MPG even before the blower boost picks up...
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  #85 (permalink)  
Old 12-26-2012, 01:19 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
But Crane Cam #113841 F-278-2 is suitable and will have plenty of thump.
Lunati 401A3Lun is another good one for this.
The tighter you set the valve lash, the more thump. (effective duration)

Do not go less than a 110 LSA for the blower motor.
The cast dished pistons are fine up to 7psi boost as long as detonation is avoided.
Low engine compression, good gas, easy timing under boost, reasonable blower pulley drive ratio.
6-7psi makes a lot of street power.

The crane cam is just right and the price is right. Needs a stock diameter valve spring swap and pinned rocker studs
on stock heads. If you do a good job porting the 920 heads it will make very impressive power and torque.
This seems like a much better plan then the 383, more fun too....will likely try and step up to a budget forged piston tho....a small safety net considering how much my stuff gets abused. I checked the summit rebuild kits but I believe all their forged slugs are flat top only....so I may have to piece together everything instead of a simple rebuild kit. I'm sure that will drive the cost up somewhat.....yah, that crane piece is cheap for sure, even the lunati isn't bad, plus whatever the cost of lifters will be....Howard's are inexpensive, as are the summit brand but no idea on quality there..
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  #86 (permalink)  
Old 12-26-2012, 02:22 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
All the advice you will see me post about these simple blower motor combos are based on either combos I have built or have advised friends here to build. They have all worked really really well. Cars, truck and boats.

Had one friend here , years ago got carried away with high blower boost and timing on stock cast pistons (12psi) and pump gas. Lost a piston when it detonated. He went a lot further than I said he could
reliably and found out why. This is what happens when you exceed the laws of physics.
Not rocket science. Its very hard to beat supercharged street power.

I have a simple low low budget build on the go now based on a stock low cr 305 and the weiand 177 blower with some simple upgrades and mods. It will make well in excess of 430hp on pump gas when its done. Will be using the same Crane F278-2 camshaft in this one.
Its a low 7.2:1 cr so can hit it with quite a bit of boost on pump gas. Ported chevy "920" heads.
Staying within the laws of physics and not getting greedy on boost is the key to reliable supercharged power.
Makes sense to me.
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  #87 (permalink)  
Old 12-26-2012, 04:06 PM
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.will likely try and step up to a budget forged piston tho....a small safety net considering how much my stuff gets abused.

Getting forged pistons will not allow you to turn your brain off (abuse the motor). All you will do is wreck a more expensive set of forged pistons. The result is the same. The repair bill is just bigger.
They key is to not abuse the motor. (correct tune for the fuel being used).
The piston is not stressed as long as detonation is avoided.
Detonation is avoided by correct tuning.

Got a question: What is the camshaft that is in the motor that is in th car, right now?

The forged pistons you are looking for are the L2441F (30) (40) {oversize}
they are -22cc D cup.

note:
Most all the budget blower and nitrous motors we did were cast pistons. 1 failure in 30+years.
Low compression is one of the keys. The cam matters. (there is a method to my madness)
Good fuel and correct tuning is another key. Not getting boost greedy on pump gas allows extended play credits too. LOL
You want to play (crank up the boost and timing) you got to pay (for the tank of 110+ octane good fuel).
Ther are some things you cannot do "cheap" reguardless of the $$$parts$$$ in the motor.
So don;t let forged pistons give you a false sense of security.

You will get much more security by keeping the tune well within the laws of physics.

Last edited by F-BIRD'88; 12-26-2012 at 04:18 PM.
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  #88 (permalink)  
Old 12-26-2012, 04:20 PM
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how many CFM of air does the 177 blower efficiently flow? Ive been slowly researching/reading about boosters.EXAMPLE: I see a small block needing 2 GT-25 turbos to make decent power(for what I would build/want) I have not looked into blowers yet
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  #89 (permalink)  
Old 12-26-2012, 04:24 PM
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Ultimately, idealy on a (high boost,max power) roots blown street 350 (pump gas) you want to combine the -22cc piston with a 80 CC combustion chamber. (7.5:1 cr)

This allows the most blower boost with the least spark retard on 92+octane.

The 920 heads can be finished to achieve a 80cc combustion chamber. Most of the large chamber aftermarket SBC heads can too.

Last edited by F-BIRD'88; 12-26-2012 at 04:31 PM.
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  #90 (permalink)  
Old 12-26-2012, 04:42 PM
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Realize the boost and power is easily adjustable with a simple pulley swap.
You don't need 12 psi boost to have a lot of fun on the street/at the track with your budget 350.
6 to 7psi is a ton of fun. especially when the motor is set up to use the boost ( ported heads/cam selection etc)
you are way beyond 450hp at this point. The hp does not describe the raw torque the supercharged engine makes, when you get on it @6-7psi boost, good pump gas and a bit of spark retard.
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