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Old 05-25-2013, 10:31 AM
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blower blew head gasket

OK bought a b@m 144 blower was told would be alright to put on my engine and it would take it just fine well stupid me did......ran great the timing was off put the timing to 22 advance to 30 and I blew a head gasket out it looks like it started to eat my aluminum heads a little around the head gasket.....it's a 383,,,, pistons I can't seem to find info on so don't know the compression but they are L2403n -030 got pro comp head 195 64 cc....
the blower has a 6 inch bottom crank pulley and the top is 2.50 the thing is they said it was a 3.66 top pulley and never even checked the size tell now I had no boost gage on it only because the small town parts store don't have one....did I have way to much boost? or compression to much? can I put a new gasket on it and run it without the belt to limp me home for now with the timing at 22 or do I move it back to 34 like it didn't have the blower on it? it didn't blow the head gasket bad eather look like a tiny little hole in the 7 piston to the little water hole a 1/4 for the head gasket steel ring.....any info would help out allot I for one think I have to much boost with that upper pulley just thinking or hoping that is it
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Old 05-25-2013, 01:08 PM
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The engine compression ratio is way too high and the blower drive ratio is way too high.

a 6 " crank pulley and a 2.50" top pulley gives a 2.40:1 drive ratio.. Needs 110 octane gas or water methanol injection or a low 7.5:1compression.
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Old 05-25-2013, 01:25 PM
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Instead of fubaring up that 383 that has the wrong compression ratio trying to supercharge it
with a small blower and a high drive ratio Which will result in more engine damage.
Why not use the 144 blower on a engine that can use it.
Build a simple low compression ratio 350 with 7.5:1cr.
Now the 144 blower wit a 2.40:1 drive ratio will work and make good power on pump gas.
-22cc pistons 76cc heads.

On your 383 you will need to limit boost to 3-4psi
limit the blower drive ratio to 1.95:1 or less (3" top pulley)
and reduce timing under boost.
almost not worth supercharging it.

you will need a boost timing retard box and the carb will need rework for the blower.
The 144 blower is a bad choice for a 383. But if you insist then keep the boost low.
Your compression ratio is too high. likely around 9.3:1 OR MORE.
Not compatable with a supercharger, on pump gas.

the 144 blower works best on a low 7.5:1cr 350 if you want to run it on pump gas..

The faster the blower drive speed, the higher the charge air temp.
requires high octane gas and or a very low engine compression ratio.
or intercooling.

find a low compression 305 or 350 for the 144 blower.

Last edited by F-BIRD'88; 05-25-2013 at 01:40 PM.
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Old 05-25-2013, 01:28 PM
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Here's the piston. Although there is no info concerning the dish volume, I would call it maybe 12cc, so that your static compression ratio is around 10.3:1 with the 64cc heads. Did you not do any research at all before you bolted the blower on? You'll have to change pistons and heads to run any boost at all.
http://www.summitracing.com/parts/TR...NF30/?rtype=10
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Old 05-25-2013, 01:42 PM
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I have a very good street blower motor build recipe you can follow that does work real well with the 144 blower and the 2.40:1 pulley drive ratio.
It is based on a low compression but simple to build 350. low 7.5:1cr. and goes like hell.

forget the 383.
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Old 05-26-2013, 08:02 AM
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76 cc heads

i would love to know how you build your 350 engine ....but for now this my only engine i don't know how to do the math but what if i put my old cast 76 cc heads on it would my com

pression be low enough...that and change my top pulley out
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Old 05-26-2013, 08:33 AM
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bandages on top of bandages?
Do everything correct or put the blower on the shelf for now.
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Old 05-26-2013, 10:10 AM
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Do you have E-85 in your area? If so that will be your only safe bet once you get the heads/head gaskets fixed. While you're at it, put a set of MLS head gaskets in there.

Your compression is too high for regular pump gas and the boost you were trying to make, as mentioned above you will have to slow the blower down so much, you might as well not have in on there for pump gas.
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Old 05-26-2013, 11:55 AM
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no e 85

nope no e 85 one of the biggest problem here is this is the first blower in this small small town and I have no one to talk to about them so it's all about reading books and resources on the internet.....but in might as well go buy a 350 block and start over.....
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Old 05-26-2013, 02:45 PM
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Why not pick up a used dished piston (stock) 305 or 350 and use the 76cc heads on it to build a simple low cost motor to install the 144 blower on and learn about supercharging.
Got be a good used 305 there . Keep it real simple and cheap. If it needs rings and bearings and cylinder hone job
to freshen it up so be it.
Keep it real simple.

The 76cc heads can work pretty good with some home porting.

add a simple low cost Summit K1105 hyd cam, lifters and some summit hi perf valve springs.

bolt the 144 blower on this. Start with a 2:1 drive ratio 6" crank 3" top pulley.
Get the tune right , then step up the boost.
a 750cfm carb works good. needs a few simple mods for the blower.
Timing curve needs a few simple mods.
a boost timing retard box too.

You'd be suprised how much power this simple low buck near stock motor will make with the blower on it.
It will leave that 383 in the dust.

not a lot of money. but a lot lot of fun.

What is the casting number on the old 76cc heads? Some are more suitable than others.

This simple low cost motor will make well over 400 supercharged horsepower.

You want the engine compression ratio to be less than 8:1...lower cr is better
put the (home ported) 76cc heads on a (blower cammed) stock dished piston 305 and you can really step on it with boost.

As the resulting compression ratio will be 7.14:1

Your only problem will be trying to wipe the silly grin off you face the first time you rug it.

Calculate engine compression ratio
http://www.wheelspin.net/calc/calc2.html

Another really good street blower cam that really lets the 144 blower do its stuff is a Crane F278-2 #113841
Use with a 3500 stall. use this in a LOW cr 305 or 350 with the high boost pulley on the 144 blower.
Be prepared to hang on when you rug it. (28-30deg timing under boost on pump gas, with the 2.40:1 drive ratio)

All you need to get started is a 305 that runs and will pass a compression test. Its good to go.

What is the casting number on the old 76cc heads, you got there? Some are more suitable than others.

Last edited by F-BIRD'88; 05-26-2013 at 03:14 PM.
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Old 05-26-2013, 03:10 PM
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Just so you know,,when you smoke a head gasket on a motor with a aluminum head generally usually you want
to get the head planed a bit to ensure it is flat so the new head gasket will seal.
A good machine shop can do this for you for a nominal charge.
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Old 05-26-2013, 03:23 PM
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And that's because if you're not paying attention, you can Brinell the aluminum head. What this means is that if you don't use a pre-flattened fire ring in your head gasket, such as the default Fel-Pro 1003, then the fire ring standing proud in whatever gasket you use can push the fire ring up into the soft aluminum and make a depressed ring in the material when the heads are torqued down. This is known as Brinelling of the aluminum.

Not to be confused with Fretting, which is the actual wear of one material on another material. We used to have a problem at Caterpillar with the cylinder liners fretting the head gasket.

Last edited by techinspector1; 05-26-2013 at 03:30 PM.
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Old 05-27-2013, 03:16 PM
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Quote:
Originally Posted by techinspector1 View Post
And that's because if you're not paying attention, you can Brinell the aluminum head. What this means is that if you don't use a pre-flattened fire ring in your head gasket, such as the default Fel-Pro 1003, then the fire ring standing proud in whatever gasket you use can push the fire ring up into the soft aluminum and make a depressed ring in the material when the heads are torqued down. This is known as Brinelling of the aluminum.

Not to be confused with Fretting, which is the actual wear of one material on another material. We used to have a problem at Caterpillar with the cylinder liners fretting the head gasket.
hi f bird and tech . good info there . was also wondering what a good head gasket will be for my build ? had a felpro before but people talk of MLS ?

guardin 101 listen to these guys. great advise , and agree with all they say. low comp on a stock engine is fine. just keep det and knock away , timing at least 30d or more if it will take it . but a 350 is a great choice . my next build is a 350. may be a idea to you tube a home made water meth set up coming in off of a boost trigger sender from intake, would be a good intercooler . be carful with what you have, and if you have to use the set up then spent out on the best fuel ,
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Old 05-27-2013, 03:54 PM
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cat problem

Quote:
Originally Posted by techinspector1 View Post
And that's because if you're not paying attention, you can Brinell the aluminum head. What this means is that if you don't use a pre-flattened fire ring in your head gasket, such as the default Fel-Pro 1003, then the fire ring standing proud in whatever gasket you use can push the fire ring up into the soft aluminum and make a depressed ring in the material when the heads are torqued down. This is known as Brinelling of the aluminum.

Not to be confused with Fretting, which is the actual wear of one material on another material. We used to have a problem at Caterpillar with the cylinder liners fretting the head gasket.
The fretting of cat engines was not enough linner protrusion when engines built,especially higher hp 3406s,usually starts with #6,as it has poor water flow that end of the block,we experianced a very high failure rate as most engines in trucks wher high hp. in bc .The cause was not over boost or poor gaskets.cat uped the #of engines built pr day and allow tolerances to slip
gas engines ar far more prone to gasket failure when boost and comp to high
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Old 05-27-2013, 08:09 PM
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"guardian101", makes me wonder how you came into that handle; 101 for Hwy 101, and guardian for LEO? Just curious. Have you been to/run at the West End Thunder Drags at the airport? Glad the FAA approved the drags for a few more years out there. I can't help you at all about the blower situation, but firebird88 seems to have a choke hold on it for you. Good luck with your project. There's a 144 setup on the Seattle area Craigs List at the moment; just the price alone caught my eye. Butch/junior stocker.
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