Blower Expert Needed

Ok....well here is what I am planning on building.....going to use either a 350 or a 400 SBC.......I want to run a 177 ci blower, carb choice will either be 2 small holleys, or even 2 two barrel carbs. I am going to use 71 Lt1 heads (similar heads for a 400 with steam holes if thats the choice i choose)........Now keeping the compression down to 9.0:1 on both motors......and a goal of 500-575 HP......what would be my goal in a hydraulic flat tappet camshaft, or should I consider solid. It will see some street and definately track. From what I have gathered, to maintain boost in the upper rpm's without detonating, I need some overlap but not to much.......would keeping the LSA at or higher than 112 degrees and the duration ar .050 at or slightly above 228 degrees. My goal is keeping the motor extremely efficient, and very reliable, but also want the ability to possibly spray it with a 100 shot in the future. Taking into consideration the dynamic compression ratio will increase with the added boost, i also want to be able to run pump gas. Now is the time i ned to ask the experts so please fire away guys, nothing like gaining knowledge.......thanks.

you will need a lot of block prep work a verry good set of piston srp je ross etc . a set of h beam rods or the billet i beams steel 4130 or better crank .stud every thing mains heads use the mls head gaskets plug the deck holes up you can use pipe plugs and drill them out . for water . on the cam i wound look at 4-7 swap some thing in a mechanical roller or solid on a 112 and some head work polish the chambers . boy i dont know about the 100 hp shot this wound be the acid test:HMMM:

Pat, you say you have a customer that reuses his copper head gaskets and his block is O Ringed. I was told by my engine mechinist to chuck um every rebuild, do to the O Ring grooves the head gasket. I am going to run the Titans when I put my motor back together. I didn't have any luck sealing the straight copper gaskets with Hylomar, of course I had other problems. That's what you get trying to build a street motor out of a race block! Have you used any Titan Gaskets yet? If you ran into any problems? I would like to know how you fixed them. I don't want any oil leakage this time. I know they are expensive. I hope this time I don't have any problems with the motor. I put my same blower (B&M Powercharger 250) on a POS SBC and had ZERO issues. But, I didn't drive it hard nor was I pushing any decent boost! Less than 5PSI on the gauge. Strange how that works.:CRY:

81 Cabelllero, I have a SBC B&M Blower Cam with Springs and Lifters. Brand spanken new still in the damn box! It's a hyd tappet, if your interested.

blwn 31.....thanks but i dont need a blower cam.....I use a local cam grinder for all my profiles, his work is second to none as far as my experience and others at the track......Im liking what I ve read thus far on the posts reguarding o-ringing the block verses not to. I understand the issuse betweena race motor versus a street motor. I think o-ringing the block would be only benificial to high boost full out race motors....thats from what i've gathered so far.......I've decided not to o-ring mine....if all im going to be producing is maybe 8psi......good sealing metal gasket will do.......how does fel-pros, perma torques stand up to small boost?.....I just picked up a set today for my other motor, quite sturdy looking thats for sure....

i do not see any thing with the o ring gaskets why you would need to get new ones every time. i know he as used them more than 4 times. and mark them for each side of the block . he's has used fel-pros perma-blue more than that .i can say that the tiatan gaskets look good . but have not use them .with the o rings on the head gaskets this will help with water and the oil deal with the copper gaskets. and if the o ring are to hi on the deck of the bock they do not seal up and it will take more than hylomar to seal them . the b@m blower works good i like mine. i see that you have a aluminum block . what type is it ?

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Originally posted by 81 cabellero
blwn 31.....thanks but i dont need a blower cam.....I use a local cam grinder for all my profiles, his work is second to none as far as my experience and others at the track......Im liking what I ve read thus far on the posts reguarding o-ringing the block verses not to. I understand the issuse betweena race motor versus a street motor. I think o-ringing the block would be only benificial to high boost full out race motors....thats from what i've gathered so far.......I've decided not to o-ring mine....if all im going to be producing is maybe 8psi......good sealing metal gasket will do.......how does fel-pros, perma torques stand up to small boost?.....I just picked up a set today for my other motor, quite sturdy looking thats for sure....

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i wound not use the fel-pro blue if you going to shoot it with Nos .i wound ues the mls gaskets they will not move out like the fel-pro will from booost and Nos but have run 8 of boost on a small block with the race fel-pro s it was 9 to1 no NOS

I used the Fel-pro race gaskets on mine. I'm only pushing 7psi max and no nos. I ran the hell out my car this weekend just to see if it could take it. This B##ch is running. I had no problem with detonation, I'm holding boost all the up. Now I have to much stall for street racing. I used to run it up to about 2800 and it left hard on the street. Now no matter where I hold it, it tries to burn the air out the tires. Going from a hot 383 to this blown 420 is just unreal. I did two runs Saturday night, one was a stang with a Paxton, and he just as soon drove his girlfriends metro. The other run was a long time rival '71 Nova with a hot 383 and about a 175 shot of NOS. He jumped me off the line about a car and a half while I was pedaling. When she did finally decide to bite down I blew by him so bad that I think I sucked his nos bottle empty. I definitly think I got the blower huffing right. I don't think I could stand to put NOS or any thing else on it.**)

Congratulations!!, I love it when a good plan comes together. :)

It's a 93' Aluminum Rodeck. It's been blown up 3 times, 2 window jobs #7 and #8 and had the #2 main saddle blown out of it but you would have a hard time telling so. I got quite the deal on it. It's a pretty piece. I think we miss understood each other on our last post. You say "...o ring gaskets why you would need to get new ones everytime", my engine has the O Rings in the sleeves. Now the copper head gaskets have a groove in them from the stainless wire O Ring. I would find it hard to believe you could get a good seal on the cylinder using the same head gaskets. Are you running the Mega Blower? It's to tall for my installation that's why I went with the Power Charger 250. I will be able to put the hood on and have a, HeHe sleeper. Yeah right, They will know form the blower whine and exhaust note there's something lurking under there! I just checked out your Pics, damn, are you running a big block Aluminun Donovan?

an intresting caveat about nitrous... it cools the fuel mix, offsetting some of the heat the blower is creating; producing a denser air charge.

nitro and blowers are a tricky combo....but they can work together

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Originally posted by blwn31
It's a 93' Aluminum Rodeck. It's been blown up 3 times, 2 window jobs #7 and #8 and had the #2 main saddle blown out of it but you would have a hard time telling so. I got quite the deal on it. It's a pretty piece. I think we miss understood each other on our last post. You say "...o ring gaskets why you would need to get new ones everytime", my engine has the O Rings in the sleeves. Now the copper head gaskets have a groove in them from the stainless wire O Ring. I would find it hard to believe you could get a good seal on the cylinder using the same head gaskets. Are you running the Mega Blower? It's to tall for my installation that's why I went with the Power Charger 250. I will be able to put the hood on and have a, HeHe sleeper. Yeah right, They will know form the blower whine and exhaust note there's something lurking under there! I just checked out your Pics, damn, are you running a big block Aluminun Donovan?

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yes i am taking about a block that has been o ring on the deck and he has used them more then 4times copper gaskets. are reuseable. how many times?? i can t tell you that. like i said this guy has reused fel-pro blue 1/2 a dozen time .the o ring will cut in some but he puts them back on the same side and use them again.yes i have a donovan block engine this is very light. less than 500 for a big block .and over 600cid. i have the mega on mine .but i do like the looks of power charger you have . both of them are my street cars both sleeper ??:whacked:

thats wicked man......for sure congrats.......blown 420 small block, yikes, post some track times when you race it, sounds like it will pull a good number......nice and reliable.....thats why im going to build a blower motor as my next project......awesome

Hot Rodders,

When I was planning this stroker and getting my budget in order, I had originally planned a 10:1cr and a professional port and flow job on my heads to support the air-flow
requirements of 420 cubes. Well right in the middle of my build this 177 blower came up on E-bay and I jumped on it, called Ross and dropped my compression a point and spent my head work dollars on the blower setup. I was thinking I'd pull'em off later when I could and get done then........But I've been thinking........UH OH WATCH-OUT........... Question is: Heads are flowed under a vacuum I think:confused: If that's the case, then under pressure they should have bigger flow numbers, therefore
eliminating the need to port a decent flowing head. Seems like if any work would need to be done it would be on the exhaust side,
and then thats off-set by the extra lift and duration of a good blower cam. I have 1 7/8 headers with 3" flow masters and aluminized pipe to the rear of the car.Which leads to another brain drain...............

When setting up exhaust for a naturally aspirated engine, wave tuning the collectors and mufflers can really enhance performance, but with a blown engine is there a need to tune wave impulses.................

SO IN SHORT FORM:
1. Is head porting beneficial with a blower???
2. Is ex. wave tuning important with blower??

the quick answer would be yes on 1 and on 2? this is hard to say i do not think to much about the ex wave tuning on the ex .i look at it very simply more hp the better and bigger it has to be. i have done on the small block 3 inch with an x cross. a 3 cars with out on blown cars. i think this helps with the ex wave tune flow pulse or that you want to call it .this is were a dyno would cut thru this. on the heads i would work on the ex side and a bowl job port size will still help on a blower engine all this wound need time on a dyno with sets of heads and cams to get all the hp you want to get out of it and cost a hell of a lot so???like what you have .or do one thing at a time and see if it helps the ex cross would be the first thing i would do:whacked: