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Old 06-27-2013, 09:19 PM
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Need help procharger on 406 sbc 10.5 cr?

Hello everyone I'm back. I posted a couple of months back when I was building my 406. Well the engine is running like I champ I've killed a couple of high horse lsx vettes with old faithful. I'd like to get more power out of this engine and lately Ive been seeing the vortech and procharger kits for sbcs going cheap.i was thinking about slapping one on, the 406 has about 10.5 cr, afr 210s and 560 Hyd roller. I know it's a bit much on the compression, we do get 93 octane here in Texas so if that helps, and I can use e85 if need be. I wouldn't mind keeping it low boost and maybe some meth with a msd btm. Well any help is appreciated thanks y'all!

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Old 06-27-2013, 11:04 PM
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are you serious?
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Old 06-28-2013, 08:29 AM
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4 lbs max boost on E85.

peace
Hog
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Old 06-28-2013, 02:17 PM
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If u put a thick head gasket on it and run it on race gas u could do it. but only with very low boost because the cylinder pressure would be really high. If u want more power with that compression ratio put a nitrous system on the engine
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Old 06-28-2013, 02:36 PM
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Quote:
Originally Posted by 78C10 sleeper View Post
If u put a thick head gasket on it and run it on race gas u could do it.
Please don't suggest this to anyone else. It's bad information. The motor will knock worse with a thicker gasket because of the increased width of the squish dimension.

Static compression ratio is adjusted by changing any of these......
Bore
Stroke
Combustion chamber volume
Block deck height
Piston deck height
Head gasket volume
Piston crown configuration

Squish is adjusted by.....
Changing piston deck height
Changing head gasket thickness
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Old 06-28-2013, 02:39 PM
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Quote:
Originally Posted by 2fast4love View Post
Hello everyone I'm back. I posted a couple of months back when I was building my 406. Well the engine is running like I champ I've killed a couple of high horse lsx vettes with old faithful. I'd like to get more power out of this engine and lately Ive been seeing the vortech and procharger kits for sbcs going cheap.i was thinking about slapping one on, the 406 has about 10.5 cr, afr 210s and 560 Hyd roller. I know it's a bit much on the compression, we do get 93 octane here in Texas so if that helps, and I can use e85 if need be. I wouldn't mind keeping it low boost and maybe some meth with a msd btm. Well any help is appreciated thanks y'all!
Change pistons, drop static compression ratio to between 8.00:1 to 8.50:1
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Old 06-28-2013, 02:47 PM
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That is tru I didn't think of that. I was just trying to address the static compression ratio. Im Runing a somewhat thick heads gaskets on both of my Supercharged engines but I must have gotten lucky. But I also only run C16 race fuel
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Old 06-28-2013, 02:57 PM
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Quote:
Originally Posted by Hogg View Post
4 lbs max boost on E85.

peace
Hog
multiply by 3 and add 2 and you're closer to the real number.

On E85, you can run 10psi all day long with no worries, and when properly tuned and managed a lot more.

Many people fail to realize what ethanol allows you to get away with compression wise.

My advice would be to talk to a guy familiar with this type of build, none that I can think of on this board are, but there's probably a few lurking. Some pro shops turn out builds like this fairly often now though. E85 is basically race fuel at garbage fuel prices.

Look at what the turbo LS1 guys are running to get an idea- its far more than 4psi. you can run 4psi on 93 octane.
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Old 06-28-2013, 02:58 PM
How fast is fast enough?
 
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Quote:
Originally Posted by techinspector1 View Post
The motor will knock worse with a thicker gasket because of the increased width of the squish dimension.
Please don't suggest this to anyone else. It's bad information in regards to boosted engines where you can open up the quench significantly with no ill side effects.
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Old 06-29-2013, 11:19 AM
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It can be done

Hi All

Well I did not see any words about ring end gap.When building a blower motor you must use more ring end gap.How much depends on your final cr.There are charts that tell you staic cr.and how much boost will give final cr.Once final cr. is found then the rings are set for that cr.The reason low cr. pistons are used is to allow more air and fuel in for a given final cr.Do more research.And Good Luck.


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Old 07-01-2013, 01:40 PM
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Comp ratio has nothing to do with it, it is cylinder pressure which creates more heat which closes the ring gap.It is controlled by type of fuel,cam timing,load,blown or n/a,bore size. Example: On our nitro engine with 4.125 bore,the gap is .032 top,.028 second.This is with 48 lbs of boost at 10524 rpms. Lower comp ratio=less cylinder pressure at a given boost which equates to less chance of detonation.Usually if its detonating,we take away fuel %.
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Old 07-01-2013, 03:28 PM
How fast is fast enough?
 
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Quote:
Originally Posted by LilSmoke View Post
Comp ratio has nothing to do with it, it is cylinder pressure which creates more heat which closes the ring gap.It is controlled by type of fuel,cam timing,load,blown or n/a,bore size. Example: On our nitro engine with 4.125 bore,the gap is .032 top,.028 second.This is with 48 lbs of boost at 10524 rpms. Lower comp ratio=less cylinder pressure at a given boost which equates to less chance of detonation.Usually if its detonating,we take away fuel %.
What happens at 10523 rpm?

Just curious.
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Old 07-01-2013, 05:31 PM
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you cross the finish line.
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Old 07-01-2013, 09:00 PM
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re your quote

Quote:
Originally Posted by ap72 View Post
What happens at 10523 rpm?

Just curious.
you might want to mention your post was a joke(numerically)
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Old 07-01-2013, 09:20 PM
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Thanks everyone, after much consideration I'm going to pass on the supercharger. Wish I would have gone on lower compression instead. I would try to sell my heads and swap out but there are to many cheapskates in my city. Thanks again
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