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Old 03-01-2005, 10:44 AM   #1
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Default Boost and a L27?

How much boost can L27 handle? Has anyone tried to boost a L27 with either a supercharger or turbo before? I'm thinking about making a turbo for a L27 bonneville. And yes I know about a L67 swap but I like the L27 power band and would love to see how it reacts to a turbo.


Thanks in advance
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Old 03-01-2005, 10:57 AM   #2
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Well, it has a low compression which is suitable for boost, but I don't know how strong the internals are to handle an excessive amount.
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Old 03-01-2005, 11:13 AM   #3
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Quote:
, but I don't know how strong the internals are to handle an excessive amount.

Believe me the last thing I want to do is blow up the motor . My father would never forgive me . How much compression does a L27 have? I tried to goole it but didn't find the numbers. I know that the L27 went up in compression in 1993 but how much I haven't found out yet.
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Old 03-01-2005, 11:24 AM   #4
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http://bonnevilleclub.com/forum/viewtopic.php?t=24923

This might answer some of your questions...or leave you with more.
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Old 03-01-2005, 11:40 AM   #5
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It'* been 8.5:1 the whole run. No change in compression.

8.5:1 compression ratio
dished pistons
forged crank
shot peened rods. (l67 has forged rods & pistons afawk)

Nearly all engines in good shape can take 5/6 or so PSI with very little tuning.
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Old 03-01-2005, 12:10 PM   #6
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Quote:
Originally Posted by BonneMeMN
It'* been 8.5:1 the whole run. No change in compression.

8.5:1 compression ratio
dished pistons
forged crank
shot peened rods. (l67 has forged rods & pistons afawk)

Nearly all engines in good shape can take 5/6 or so PSI with very little tuning.
Everytime you talk tech I feel like I've been left out of a meeting.

When did the forged crank come about? Do we know the rods are shot-peened? Have we gotten any new news on the pistons that says they're forged?

You need to start inviting me to these BonneMeMN meetings :P
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Old 03-01-2005, 12:17 PM   #7
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That one surprised me, too. Those are still unconfirmed.
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Old 03-01-2005, 12:52 PM   #8
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Quote:
It'* been 8.5:1 the whole run. No change in compression.
http://engine.firebirdv6.com/3800history.html

In the middle of the histoy it says

Quote:
Roller rocker arms, a higher compression ratio, and reduced piston ring tension improved efficiency in 1993.
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Old 03-01-2005, 01:03 PM   #9
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Quote:
Originally Posted by OLDsman105
Quote:
It'* been 8.5:1 the whole run. No change in compression.
http://engine.firebirdv6.com/3800history.html

In the middle of the histoy it says

Quote:
Roller rocker arms, a higher compression ratio, and reduced piston ring tension improved efficiency in 1993.
A higher cpmpression ratio was incorrect.... It was and is 8.5 to 1 for all 1988-95 Vin C, L and 1 engines..... I don't know where they got that info from but there was no change in compression.. Only lower friction piston rings, and roller rockers were the changes for 93..

Now the 3.0 and later 3300 Buick V6'* did use 9.0 to 1 compression... The only change in compression for the 3800 was with the Vin K engine to 9.4 to 1...<---- That they got correct...

I have seen a few sites that have flawed info...

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Old 03-01-2005, 01:50 PM   #10
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Quote:
Originally Posted by BonneMeMN
8.5:1 compression ratio
dished pistons
forged crank
shot peened rods. (l67 has forged rods & pistons afawk)
I know I'm S2, but I don't think I even have a forged crank. If you read up on ZZP'* L36 stroker kit, they say that the stroker crank is a reworked stock crank. Then they go on to say that they got the crank to snap in half when they boosted it up to ~375 whp. That sounds too low for a forged crank. So if the L36 crank isn't forged, I'd guess the L27 isn't, either?
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