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  #61 (permalink)  
Old 12-26-2012, 12:24 AM
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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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  #62 (permalink)  
Old 12-26-2012, 02:02 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, 09:27 AM
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Fair enough.Thanks for the reply
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  #64 (permalink)  
Old 12-26-2012, 01:23 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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  #65 (permalink)  
Old 12-26-2012, 02:19 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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  #66 (permalink)  
Old 12-26-2012, 03:22 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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Old 12-26-2012, 05:20 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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  #68 (permalink)  
Old 12-26-2012, 06:46 PM
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I'm told its a comp 268, but honestly don't know, and if I'm going through the effort of pulling the motor then I'm going to swap anyways. I would port the 920's, and I'm guessing with a bit of "unshrouding" of the combustion chamber it will increase the cc's. As for the forged pistons, I really don't want to spend the money but if I'm going to be there anyways, I figured it just makes sense....believe me, I would rather do it cheaper....but meh....what do you do. The goal here is use the heads I have, valve springs and a set of long slot summit rockers, arp hardware throughout, the 750 I already have. And the blower. I assume the torque of the blower will help with my wussy 3000 stall and 456 gear selection lol...so if i order a rebuild kit without pistons, then order the ones you mentioned, are the moly rings that come in the rebuild kit going to work? I have to admit, I have driven in a couple blower cars, one with an 871 on a 496 and a few paxton pushed 5.0 stangs....and the low end off idle is so violent....i just always assumed the price to play in that territory was outrageous so I never even considered it. But really, If I can make 355 that will turn these huge meats I will be happy. And 114 is readily available just down the street from my shop so if a can do a pulley swap, a jet change, and go to the track every few weekends it would be perfect.
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  #69 (permalink)  
Old 12-26-2012, 07:23 PM
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I'm going to assume a modded hei isn't going to cut it in this application and will need an ignition box with boost referenced timing retard? Or is it something where I'm running say 7psi and set the timing at a locked "safe" amount and leave it alone?
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  #70 (permalink)  
Old 12-26-2012, 08:42 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
look for a MSD 5462 BTM box on ebay,Kijiji etc ( its there). Hooks to a HEI.
Its worth more to you than the forged pistons at this point.
If the cam is a XE268H-10, use it as is.
girlie cam blower cam and lifters summit K1105 $99.

If all this is just to much bother, build your 383.
Nope, not too much bother at all, I have to make rear shock mounts, as there currently isn't any at all, rebuild the trans, run exhaust, and pull the motor, realistically the dollars and cents isn't going to be alot different then a 383, but the power, the grin factor, the cool factor, and the fact that a pulley change, some good fuel, will hopefully get me into the 11's it seems dumb not to do it. I did an alum head big cam 350, did a budget 350 with junk parts, did a 406 this summer, all were successful, so this is something I badly want to try...and with a little help, (alot) and some common sense I think I can make it work.
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  #71 (permalink)  
Old 12-26-2012, 08:53 PM
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And your right, several of the MSD box's on eBay cheap cheap....
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  #72 (permalink)  
Old 12-27-2012, 08:36 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
Is the 177 blower going to fit under the hood on your car?
If not, is that a deal breaker?
Hood scoop, Blower scoop?
Got to question if it's really nessessary to rebuild this engine at all
in order to supercharge it. (moderate 5-7psi boost)
I could stuff an 871 under the hood with no issue.....lots of space and the motor sits looooow.......OK, so in theory sure, I could throw a blower on this as it sits, but I know the oil pressure is on the low side, not bad, but not great. No smoke, no noise, but the unknown factor concerns me....I could pull the heads, port them, freshen them up, and install with new valve springs, add a new HEI, the blower and the timing retard. And let it eat.....if I get the summer out of it then great.....but really, assuming a small cam, 268 or possibly even an RV style cam that's already in it, what kind of power can i make at 7psi?
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  #73 (permalink)  
Old 12-27-2012, 09:04 PM
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Quote:
Originally Posted by bygddy View Post
I could stuff an 871 under the hood with no issue.....lots of space and the motor sits looooow.......OK, so in theory sure, I could throw a blower on this as it sits, but I know the oil pressure is on the low side, not bad, but not great. No smoke, no noise, but the unknown factor concerns me....I could pull the heads, port them, freshen them up, and install with new valve springs, add a new HEI, the blower and the timing retard. And let it eat.....if I get the summer out of it then great.....but really, assuming a small cam, 268 or possibly even an RV style cam that's already in it, what kind of power can i make at 7psi?
If your going to pull the heads replace the oil pump as well and the shaft with a arp one. The stud kit is also cheap and worth an update. I usally use meldon high volume pumps they put out a little more pressure and a lot more volume keeps the oil pressure steady at high rpms.
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  #74 (permalink)  
Old 12-27-2012, 09:27 PM
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Quote:
Originally Posted by hcompton View Post
If your going to pull the heads replace the oil pump as well and the shaft with a arp one. The stud kit is also cheap and worth an update. I usally use meldon high volume pumps they put out a little more pressure and a lot more volume keeps the oil pressure steady at high rpms.
See, and here's where I'm at.....I can swap heads in the car, blower, dist yada yada yada without having to pull the motor, I have pulled motors, and normally its not an issue, but on this its a huge pain....we have done my dads motor a couple times on hisn34 chev and it sucks, this is very similar...fenders off etc etc....anyways....it would be interesting to simply add blower, work the heads, and see how it works....
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  #75 (permalink)  
Old 12-27-2012, 09:41 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
The 177 is capable of creating 650+ HP.
Is it 177 a Whipple??.

What is the peak of a 177 at what RPM??.

What is the CFM conversion to PSI??.
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