glenb1991

Im running a rear mount T70 on my fully built 350. Im running stock bore, stock stroke, Forged Dished pistons with a 18.6cc volume, forged h-beam rods, and im reusing the stock crank. Heres my questions:

1)should i look into getting 4 bolt splayed caps for my crank to help prevent any kind of crank walk and/or increase durability for it?

2)I kno the sts kit comes with an oil pump... many of my dsm friends wonder why and i try to tell them its to pump the oil from the rear of the car back to the oil pan. im wondering where or what pump to get for this?

With about 9.1:1 compression im hoping to run somewhere around 10 psi on a xs-power T70. I just wanna make sure i have the right oil supply needs to keep this turbo alive as long as possible.

reamo04

you can buy the pump from STS directly.

as far as 10 psi on an xs-power turbo, hopefully it doesnt blow apart for ya

ford

10psi might be asking a bit much of a rear mounted xspower t70. I have a xspower BOV i am suspect of using even brand new. Although from the research ive done most people seem to have good success with their stuff so who knows?

like the above post stated you can buy the inline pump from sts although i am unsure of the mounting location.

Are you using a intercooler?

Your CR will be fine at 9.1, but i would always suggest a 4bolt over 2. IMO its not much money for the extra assurance.

jsetzer

Most people will say no-no to the XS - I've seen some good reports so let us know how it goes.

I am @ the same compression. I am ballpark 8.7:1. Running as much as 23psi with 17ish psi being my normal. I doubt the XS is the same size as the MP but you can see. I'll have my motor out hopefully next weekend so I can tell you how my two bolt studded mains look after 4k miles at 700+ ft pounds. Oil pressure has been good and the motor ran like a top.

If you have the money 4 bolt won't hurt - I say its not needed for what that turbo is capable of, especially 10psi.

What heads and cam? If its fairly tame then I'm guessing you are shooting for 450ish rwhp?

Search for scavaging pumps - Any 12v pump rated to move oil should be ok. Needs to hold up to the temp, there is no real oil pressure on the bottom side of the turbo. Not much volume is needed.

glenb1991

yea, ive done a lot or research on xspower turbos ever since i was offered one locally for 300. They had their troubles back when they first started but theyre decent turbos for the price, and running around 10 psi shouldnt be harmful to it. In the future i plan to run a borg warner s400. The a/r on the t70 in lookin at is .84 hot side, .70 cold side. Its a fairly small turbo, meant to be ran on supras etc. alot of the supra guys are running them and i havent seen too many problems through the research.

How much is the 4 bolt conversion? and where can i get the stuff needed?

Also, the heads will just be cleaned up stock heads, and springs to match my cam which ill prolly have lloyd custom grind one for me or check out brett beaurs. I will be running an intercooler, picking one off a friend in about a month for a good price. 2.5" in and 2.5" out, its the average size intercooler you see most people running. Im hoping for north of 450rwhp, so like i said, once i get the spare cash ill upgrade the turbo to the borg warner, or just save the xtra 300 and order one.

skipjobe

The pump needs to be lower than the turbo.
Here are some pics of mine.

http://s659.photobucket.com/albums/uu320/skipjobe/

jsetzer

Any machine shop can do the 4 bolt. When I checked the labor was only like $150 - but the damn caps where like $500 or something insane.

19cc and stock heads? That should be higher than 9:1. Are you running a thick gasket or something? Well I guess that would put you @ 9.3 so thats fine too.

glenb1991

Bore=4.000
Stroke=3.480
Deck Height=.015(i think thats what i read somewhere)
Gasket Crush Thickness= .050
Combustion Chamber=58cc
Piston Volume=18.598

18.96 SCR

Even with a regular .040 gasket itd still be 9.15. Perfect compression for some boost ; D

glenb1991

wow.... what kinda turbo is that? someone before said they had to do this with their holsett turbo. looks good tho, how ya gonna seal the compartment up tho?

boosted-lt1

4-bolt splayed would be great to help keep the caps where they should be. I don't think you 'need' this with your setup though. Two bolt studs should work fine. Most boost motors don't need to turn high rpm. I don't see a concern. What power at the crank and what rpm?

I did just had a bunch of shops quote some machine work in the Detroit area. Here are some numbers for ya. Couple of things to consider - These numbers are for the splayed conversion on the center three, but I was having them quote other machine work as well. I wanted Program flat register caps. This involves machining the the block register flat out to the pan rails (no step). I don't recommend steped caps that use the stock register like you see a lot. Labor is drill/tap, fit caps, align boring & honing. Parts are ARP studs and Program caps.

• Shop1 - $400 labor + $315 parts
• Shop2 - $500 labor + $315 parts
• Shop3 - $500 labor + $410 parts
• Shop4 - $600 labor + $320 parts

JakeRobb

Shops 1, 2, and 4 are all pretty close on parts, which makes me wonder if Shop 3 is using the same stuff. Find out. If they are, then avoid them -- they mark up parts too much.

See if you can find anyone that has had work done by Shop 1. If you don't get the impression that they do substandard work (to go along with their low labor quote), then go for it.

boosted-lt1

JakeRobb,

Good observations. Shop 3 is known to do great work but also known to charge a lot and was shooting to hit a target price for the complete machining package.

Shop 1 said they never did a 4-bolt conversion before, but they could, and wondered why I didn't go buy a Dart block... They have a good rep though.

My engine project is on hold now anyway. Was hoping to help Glen with his decision.

Thanks,
Scott.

glenb1991

appreciate it boosted-lt1. Im just looking into the little thing that i just havent had a chance to consider yet. I plan to push around 450 or 500 with about 10 psi, i hope that ill hit peak boost around 4k so yea i dont have to rev higher than stock to make power.