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Blower Question
Im getting a great deal on a B&M 140 series blower with the manifold and demon carb. manifold is brand new,carb is new and blower was rebuilt by Holley, none of it was ever installed on his car, he scrapped the project. My question is this:
I have a built 355 sbc with the following build Machine work Bore & Hone with deck plate vat degrease cam bearings and installation Deck Balance Parts Pistons KB KB 112 + .040 Rings Childs Albert + .040 Rods Eagle 6" H-beam Timin Chain Cloys, street Roller Oil pump Melling high volume(no pick-up) Main bearings Cleavite 77 "P" std Rod bearings Cleavite 77 "P" std Crankshaft Cast steel, Skat Damper Powerbond HP Head Gaskets Felpro 1003 Intake gaskets Felpro 1205 Intake manifold Weiland 17530 Solid lifters 3 Comp Cam pushrods Mr Gasket Head bolts (From Pugh) ARP 4 bolt main bolts One World Sportsman II head,springs,locks& seals Head bolt washers 5 Comp Cams pushrods 7972 cam: Lunati cam-40146 Intake exhaust duration 0.543 0.552 lift@50 249 254 Compression 10.18 world product sportmans heads 202 woul i be safe running the blower on this motor? Keep in mind I plan on running 100 Octane which I have readily available locally. Any input or thoughts? |
100 octane yes, make sure you pay very close attention to the amount of boost. 4 - 6 pounds on 100 octane will be fine, any more than that will be border line for detonation ( KB pistons will not tolerate any ). Make sure your timing is 32 or 34 degrees and use a colder spart plug, such as a NGK - 8
I think the number is 5672-8 for the sportsman heads or AR133 |
Originally Posted by cncmotorsports
100 octane yes, make sure you pay very close attention to the amount of boost. 4 - 6 pounds on 100 octane will be fine, any more than that will be border line for detonation ( KB pistons will not tolerate any ). Make sure your timing is 32 or 34 degrees and use a colder spart plug, such as a NGK - 8
I think the number is 5672-8 for the sportsman heads or AR133 Will a holly 750 boost referenced carb be enough flow for this particular Motor and blower combo? Also, what kind of power will this put out? |
Carb will be fine, combo should make 500 HP
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In my opinion the only worse piston to use for that would be a stock one than a kb cast or hypreutectic in a boosted situation.
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Originally Posted by kwkracing
In my opinion the only worse piston to use for that would be a stock one than a kb cast or hypreutectic in a boosted situation.
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KB make forged piston also that are very nice and priced pretty good. I have them in my 383.
Curtis |
Originally Posted by doorracer
KB make forged piston also that are very nice and priced pretty good. I have them in my 383.
Curtis |
Originally Posted by Julianthe3rd
Originally Posted by doorracer
KB make forged piston also that are very nice and priced pretty good. I have them in my 383.
Curtis They are very nice. http://www.cnc-motorsports.com/produ...84&CtgID=12783 Agreed, Hyperutetic and boost not a great idea, but it does work if your a good tuner. |
Originally Posted by cncmotorsports
Originally Posted by Julianthe3rd
Originally Posted by doorracer
KB make forged piston also that are very nice and priced pretty good. I have them in my 383.
Curtis They are very nice. http://www.cnc-motorsports.com/produ...84&CtgID=12783 Agreed, Hyperutetic and boost not a great idea, but it does work if your a good tuner. Thats rods and pistons for that price? |
Is your motor together ? I personally would not run static compression that high if its gonna be a street driven machine..It limits the amount of boost you can run....I would drop it back to 9:1 static compression and be able to run a little more boost..while keeping the Bottom end Tq Respectable...I would also go with a cometic head gasket...Proper cam selection is gonna mean all the difference in the world...
what is your purpose with the engine,,Street or Strip ?....The Boost from a Blower motor is what the prize Treasure is all about...If you have a chance to look at a dyno sheet from one of these (smallest of blowers) I think you will find that the Tq Curve is what is so impressive about running a blower making boost...and why its most important to get the extra 3 or 4 Lbs of Boost from these blower set ups... The HP increase is OK but you will appreciate the TQ the blower makes way more then the HP. What your after with this blower is when getting it in High gear its still pulling your Nuts off at 80/100 mph I too have a 144 B&M blower I have sitting in the shop.....also got The crank,rods and Pistons...... |
Originally Posted by bjuice
Is your motor together ? I personally would not run static compression that high if its gonna be a street driven machine..It limits the amount of boost you can run....I would drop it back to 9:1 static compression and be able to run a little more boost..while keeping the Bottom end Tq Respectable...I would also go with a cometic head gasket...Proper cam selection is gonna mean all the difference in the world...
what is your purpose with the engine,,Street or Strip ?....The Boost from a Blower motor is what the prize Treasure is all about...If you have a chance to look at a dyno sheet from one of these (smallest of blowers) I think you will find that the Tq Curve is what is so impressive about running a blower making boost...and why its most important to get the extra 3 or 4 Lbs of Boost from these blower set ups... The HP increase is OK but you will appreciate the TQ the blower makes way more then the HP. What your after with this blower is when getting it in High gear its still pulling your Nuts off at 80/100 mph I too have a 144 B&M blower I have sitting in the shop.....also got The crank,rods and Pistons...... I plan on street cruising and just want more balls in my Comet, for the occasional trip to the track. But 95% driving will be street cruising. |
Originally Posted by Julianthe3rd
Originally Posted by cncmotorsports
Originally Posted by Julianthe3rd
Originally Posted by doorracer
KB make forged piston also that are very nice and priced pretty good. I have them in my 383.
Curtis They are very nice. http://www.cnc-motorsports.com/produ...84&CtgID=12783 Agreed, Hyperutetic and boost not a great idea, but it does work if your a good tuner. Thats rods and pistons for that price? |
I would need to change my cam also.
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I think I would just build a short block for the blower and leave my other motor together ,,JMO
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Originally Posted by maniac
I think I would just build a short block for the blower and leave my other motor together ,,JMO
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Heres a little cheaper selection of pistons maybe you can find some cheaper ones. This is towards the Icon pistons that you were talking about.
http://www.competitionproducts.com/I...products/1152/ |
welcome back seth....where ya been? :P
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Originally Posted by burnskustomz
Heres a little cheaper selection of pistons maybe you can find some cheaper ones. This is towards the Icon pistons that you were talking about.
http://www.competitionproducts.com/I...products/1152/ |
Originally Posted by MEMRACING62
welcome back seth....where ya been? :P
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Originally Posted by Julianthe3rd
Originally Posted by burnskustomz
Heres a little cheaper selection of pistons maybe you can find some cheaper ones. This is towards the Icon pistons that you were talking about.
http://www.competitionproducts.com/I...products/1152/ Here's the write up on the piston mentioned in the previous post. Zip. Speed-Pro POWERFORGED pistons are offered in two patented highstrength aluminum alloys – VMS-75 (for street use and many racing applications) and 2618 (exclusively for racing use). The VMS-75 alloy contains approximately 11 percent silicon which, as in selected hypereutectic alloys, greatly increases surface hardness, scuff resistance, and reduces ring groove wear. The stronger 2618 alloy, by contrast, contains no silicon and is, therefore, more susceptible to scuffing and ring groove wear. This alloy also requires increased bore clearance and thorough engine warm- |
a nice inexpensive set of speed pro (trw) forged pistons would do fine in this little blower motor.
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