Talking out loud... my L27 plans. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 05-07-2007, 06:50 PM   #1
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Default Talking out loud... my L27 plans.

ok, i'm posting this here in order to get some reactions, opinions, suggestions or constructive critisism. if my ideas are stupid, ill choosen or simply won't work please feel free to tell me. if you got a better idea, lets hear that too. but please don't tell me to just supercharge it or just drop in a series 2, because i've already decided not to.

i want to see how much power i can get out of my L27 in naturally asperated form. i'm not expecting massive gains, but i'd like to see it around L36 levels, or more if possible. i know that an engine is and engine and if i wanted to pour money onto it i could have a naturally asperated 800 hp L27. but i know that realisticly, that won't happen either.

lastly i know that upgrading the motor will probably be easier and yeild me more power, but i'm a sucker for being the underdog. there'* just something about it. the thrill of doing what people said couldn't be done. it'* satifying. it'* like getting your fat chocolat covered face stuck up on the wall-o-shame at an ice creame shop for finishing the "you-can't-finish-it-sunday" take that, everyone who said i couldn't.

so here'* the plans i have laid out right now.

Stage I:
*correct known problems
*give engine a thurough tune up
*remove AC system
*180 degree drilled t-stat
*gutted airbox+K&N
*adjust tranny mod & tranny cooler
*replace vacume lines
*NGK'* plugs, MSD coils and wires

with this i hope to gain back as much lost horsepower as possible

Stage II:
*port LIM
*port runners in heads
*port exhaust manifolds
*port TB
*high flow cat
*Moroso Muffler
*FWI
*matched fuel injectors

in stage II i hope to gain as much flow as possible with the stock parts to unlock hidden horsepower. really bring it to life.

stage III:
*higher ratio rockers
*shave head to raise compression
*valve job
*springs and pushrods
*underdrive water pump pulley

stage three really focuses on pulling more power from the stock heads

stage IV
*.030 overbore
*custom high compression pistons
*custom camshaft
*knife edged crank
*stronger rods (shot peened, cryo treated, custom?)
*ARP hardware
*balacnced rotating assembly
*rebuilt transmission with LSD and 3.73 (?) FDR

stage IV will be a stronger bottom end with a slight displacement increase. the power here should come from the increased compression and the cam. a beefy rebuilt trans will be installed at this time to help handle the load.

these mods, especially the later ones will be performed slowly and over time, as i can afford to do them. or possibly not at all. at this point i'm parading my ideas in front of you risking ridicule and the death of my already fragile and small reputation.

better ideas happily accepted. please follow "that won't work"* with "here'* why"*

-marik out
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Old 05-07-2007, 07:12 PM   #2
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you could prolly get L67 Rods and pistions to help the cause....
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Old 05-07-2007, 07:23 PM   #3
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get a stroker kit from that australian company

wren knows what one im talking about
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Old 05-07-2007, 07:48 PM   #4
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wouldn't the L67 pistons lower the compression and there fore hurt my performance or were the vin one pistons the same just stronger?

as for the stroker kit. i saw that and got very excited. they only thing i didn't like was the fact that for all that money, it'* not even a new crank. it'* simply an offset bore on a smaller circle, with a longer rod. more power plus a weaker crank. it spelled trouble to me.

http://www.comeracing.com/

although that manifold they've got looks mighty tasty.
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Old 05-07-2007, 08:46 PM   #5
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There is no difference in compression ratio, bore, or stroke between the Series 1 L67 from 91-95 and the 91-94 L27. The L67 simply got stronger pistons, rods, and wrist-pins.
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Old 05-28-2007, 08:46 PM   #6
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The Crankshaft is a NEW 3.700" crank, it'* not a stock-reworked crank. It not only is available in cast iron, but now is availabal in a 4340 Billet Steel stock 3.400" and stroker 3.700"

Quote:
Originally Posted by Marik_bathory
wouldn't the L67 pistons lower the compression and there fore hurt my performance or were the vin one pistons the same just stronger?

as for the stroker kit. i saw that and got very excited. they only thing i didn't like was the fact that for all that money, it'* not even a new crank. it'* simply an offset bore on a smaller circle, with a longer rod. more power plus a weaker crank. it spelled trouble to me.

http://www.comeracing.com/

although that manifold they've got looks mighty tasty.
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Old 05-28-2007, 08:52 PM   #7
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Quote:
Originally Posted by willwren
There is no difference in compression ratio, bore, or stroke between the Series 1 L67 from 91-95 and the 91-94 L27. The L67 simply got stronger pistons, rods, and wrist-pins.
And it also got a special coating on the crown of the piston. Damn that coating is tough too
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Old 05-28-2007, 09:13 PM   #8
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Quote:
Originally Posted by ProStreet1
The Crankshaft is a NEW 3.700" crank, it'* not a stock-reworked crank. It not only is available in cast iron, but now is availabal in a 4340 Billet Steel stock 3.400" and stroker 3.700"
of this, i was not aware. how new of a development was this? i had researched this a few years back and found only the offset bores.

even still, $3K is awefully steep. about right considering R&D and demand, but majorly out of my budget for now...but how sweet that would be.

off to buy a lotto ticket.


***edited for speeling errors ***
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