Boost and a L27?

Reply Subscribe

Thread Tools

Search this Thread

Mar 1, 2005 | 12:50 PM

#11

OLDsman105

Thread Starter

Senior Member

Certified GM nut

Joined: Jul 2004

Posts: 1,912

Likes: 0

From: New York City

Quote:

Originally Posted by jr's3800

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...

Well there goes my research. Anyway in order to tune the air fuel ratio I will need a AFC 2.0 and a scanner I'm assuming. Would putting on a L67 series 1 throttle body help or hinder the process? And will the L27 injectors hold up or will I have to upgrade the injectors also.

Mar 1, 2005 | 01:50 PM

#12

Merlin 91/97

Senior Member

True Car Nut

Joined: Dec 2002

Posts: 5,857

Likes: 0

From: Halifax, Canada 91SSE / 97SSEi

http://www.turbofast.com.au/javacalc.html

Might be something you want to check out.....

Mar 1, 2005 | 02:03 PM

#13

BonneMeMN

Senior Member

Certified Car Nut

Joined: Jun 2003

Posts: 15,928

Likes: 1

Funny, you were at the ******* "meeting".

i'm going to keep my opinion out of this now, and i'll just give you some advice. Read the link that was posted above.

http://www.bonnevilleclub.com/forum/...b958873#264116

Quote:

Originally Posted by Dr. Jay

I was just talking to Will (Bill

) and decided to look up cranks. GM parts direct lists the crank as PN: 24501594 for All application models. Unless there'* some database error that means naturally aspriated and supercharged is the same...which logically would be the case anyway.

Mar 1, 2005 | 02:37 PM

#14

dbtk2

Senior Member

True Car Nut

Joined: May 2003

Posts: 3,022

Likes: 1

From: Holt, MI & Lima, OH

Quote:

Originally Posted by big_news_1

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?

I'm not saying that the L27 or L36 crank is forged, but the strocker kit has a reworked stock crank meaning it isn't as strong as it would've been before hand. I know that an L36 crank can handle over 400whp because Zooomer runs an L36 bottom end on his car, and Digital Kens car also has a L36 block, and so does their mid 11 second Turbo GT.

However, if it can handle 375whp thats probably more than anyone here is looking for. 375whp is WELL over 400 crank hp.

Personally, I wouldn't worry about the bottom end of an L27 unless I was making over 400hp.

Shawn

Mar 1, 2005 | 02:47 PM

#15

big_news_1

Senior Member

True Car Nut

Joined: Jun 2004

Posts: 3,459

Likes: 1

From: Glendale, AZ

Gotcha.... I was just debating whether it was forged or not. But you're right; the ability to handle over 400 crank hp is more headroom than anybody here requires.... at least at this point in time.

Mar 1, 2005 | 02:52 PM

#16

willwren

Junior Member

Posts like a Ricer Type-R

Joined: Aug 2002

Posts: 11

Likes: 13

Quote:

Originally Posted by BonneMeMN

Funny, you were at the f*** "meeting".

i'm going to keep my opinion out of this now, and i'll just give you some advice. Read the link that was posted above.

http://www.bonnevilleclub.com/forum/...b958873#264116

Quote:

Originally Posted by Dr. Jay

I was just talking to Will (Bill

Nothing there was ever confirmed. We have suspicions, but unless we get someone who knows what they're looking for to tear down both engines, we're not going to know. I know both engines pretty well myself, and DrJay has done more research on this than anyone, and we still can't figure out what'* rumor and what'* fact.

Boldly stating what you did is a little touchy.

Mar 1, 2005 | 02:55 PM

#17

OLDsman105

Thread Starter

Senior Member

Certified GM nut

Joined: Jul 2004

Posts: 1,912

Likes: 0

From: New York City

Ok so from all the information I've read here

1.My L27 bottom end will withstand the extra horsepower
2.5 to 6 pounds of boost is possible with little tuning.
3.my compression information was wrong (I apoligize for that)
4.the bottom end is still under debate I think

Will I need to upgrade my injectors for 4 to 5 pounds of boost?

And what meeting are you guys refering to anyway?

Mar 1, 2005 | 02:59 PM

#18

Sol

Senior Member

True Car Nut

Joined: Sep 2002

Posts: 8,910

Likes: 3

Does it really matter if the crank is forged or not? Seriously.

The original question asks if the L27 handles boost. And yes, it does. You shouldn't need to upgrade your injectors with that low amount of boost.

Mar 1, 2005 | 03:01 PM

#19

willwren

Junior Member

Posts like a Ricer Type-R

Joined: Aug 2002

Posts: 11

Likes: 13

Quote:

Originally Posted by OLDsman105

Will I need to upgrade my injectors for 4 to 5 pounds of boost?

And what meeting are you guys refering to anyway?

1. Jason says so, others may agree. Never done, never proven. Risky.

2. Jason says so, but it'* not that simple. You'll have work to do, so buy a good scantool, and set aside alot of extra cash for custom PCM and AFC controller.

3. Compression is as jr's3800 stated.

4. May not ever be settled, especiallty with mis-information and assumptions being posted. More research is needed, but there are KNOWN differences. How much of an effect those differences will make is unknown. Refer to answer #1.