Author Topic: Thoughts On 4.1 Liter Based Builds?  (Read 14763 times)

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Offline TexasT

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #30 on: January 03 2018, 12:03:07 PM »
I went ahead and bought a torque plate. Just bolt the heads on if you don't have one. That is what you do with the one torque plate, bolt a head on the other side. Also torque the mains on there. I think on a street car I would do a half fill up to the freeze plug holes in the side so there is some cooling going on in the block.

 Another thing I Saw recently on a different brand was a pretty thick "strap" that was bolted on top of the stock looking main instead of a full on girdle. I thought I might look into doing something like that with a forged chinesium crank. I don't know how much clearance there is in the pan but if a girdle fits I don't see why these wouldn't if you made them thin enough. I guess with the forged crank and the replacement middle main caps it would be plenty for a street car.
Rich

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Offline Cool Guy

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #31 on: January 03 2018, 01:24:56 PM »
I'd like to avoid using a girdle. Looks like it would add more complexity & costs than I really need.


I have seen a picture of an engine that had the mains strapped together before, but no information on the straps. Seems simple enough. Would require a certain type of material, perfectly flat surfaces & longer studs I suspect. Don't know what the best material would be. Aircraft grade aluminum? Steel?


What are the typical weaknesses or failures on the turbo Buick V6?


How much MAP is typical? 24-30 psi?
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Offline earlbrown

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #32 on: January 03 2018, 03:33:00 PM »
What are the typical weaknesses or failures on the turbo Buick V6?


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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Forzfed

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #33 on: January 03 2018, 04:16:17 PM »
What are the typical weaknesses or failures on the turbo Buick V6?


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Offline Cool Guy

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #34 on: January 03 2018, 06:49:18 PM »
Let's remove operator error from the equation for now.
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Offline earlbrown

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #35 on: January 03 2018, 07:04:53 PM »
In that case, there are no weaknesses.


Still need to replace the timing chain, valve springs, and vacuum hoses though. :D
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #36 on: January 03 2018, 08:38:39 PM »
I went north of 30psi accidentally on my 4.1 when a vac hose went.  Surprisingly it held up well.  I did tweek the headgasket but it still held up and I did another 7 1/4 mile passes.  My major problem was the billet cam wearing into the front of the block and the crap taking out my thrust bearing.

Offline Scoobum

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #37 on: January 04 2018, 03:43:17 PM »
Bison has shoved several minutes of 9 second power through the stock short block in his blue car. I run 7 flat all day long in my own car with the stock short block. Durability depends on ones tuning ability.
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Offline Cool Guy

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #38 on: January 04 2018, 04:57:28 PM »
Bison has shoved several minutes of 9 second power through the stock short block in his blue car. I run 7 flat all day long in my own car with the stock short block. Durability depends on ones tuning ability.


How many miles are on these engines?
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Offline earlbrown

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #39 on: January 04 2018, 05:04:28 PM »
By this time..    Somewhere between 150,000 and 200,000+
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Cool Guy

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #40 on: January 04 2018, 10:47:17 PM »
Mine just turned 136K.

Third owner, adult owned, mostly original. I've improved fuel supply (Hot-wire/Walbro 255/Adj.FPR), cooling, braking & other supporting systems. Engine internals untouched. Trans is original with dealer installed upgrades during the first few years. Scanmaster, TT 91-93 octane street chip.

PS. P/O replaced injectors. Make & size unknown at this time.
« Last Edit: January 04 2018, 10:52:13 PM by Cool Guy »
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Offline Scoobum

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #41 on: January 05 2018, 12:11:08 AM »
Remove Erics chip and he'll have the particulars written on it including injector size. Part number is on the side of the injector...it'll tell you the brand. Chart is below.

http://users.erols.com/srweiss/tableifc.htm
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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #42 on: January 05 2018, 08:10:59 AM »
A quote from Jim Ruggles. 'Once you pass 600 FWHP you can expect the webbing to be the first to let go. Girdles are okay for girls, but won't do much for the block other than delay the cracking.'

Keep in mind once you hit 11.5 you'll require safety equipment.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #43 on: January 05 2018, 10:16:21 AM »
Jim and Rich here on the board can step in and fill you in on the parts and mods to keep the 200's alive deep into the 10's. They build their own. You have to overbuild them from what your ET goal is. I have more money tied up in this 200 than what my house is worth.
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Offline Cool Guy

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Re: Thoughts On 4.1 Liter Based Builds?
« Reply #44 on: January 05 2018, 11:18:19 PM »
Who's the best trans builder in the Southwest?
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