[SR-71Blackbird]

first off....is the stock bore 3.551 or 3.552

cast crank should be fine, just lookin to get rods and pistons/rings...I wanna go with the same dish as the PI engines (17cc right) to bring the CR back down

any thougths/recommendations on where/who to get the internals from?

guys who have built forged bottom ends, what'd you use?

thanks, steve

 

[TGJ]

first off....is the stock bore 3.551 or 3.552

cast crank should be fine, just lookin to get rods and pistons/rings...I wanna go with the same dish as the PI engines (17cc right) to bring the CR back down

any thougths/recommendations on where/who to get the internals from?

guys who have built forged bottom ends, what'd you use?

thanks, steve

Steve,

Stock bore is 3.552".

I have a Cast crank, Diamond Pistons and forged Rods, but I forgot which ones I have...

Modular Performance, Renegade Racing, Triangle Speed Shop can set you up with what you need...

 

[warmaster259]

I have cast crank, Manley Forged Dish Pistons .20 over, Manley Forged I-beams.

 

[Jurgen]

http://www.modularperformance.com/miva/merchant.mv?Screen=CTGY&Store_Code=MP&Category_Code=EK

 

[GreenBird]

first off....is the stock bore 3.551 or 3.552

Neither. 90.2 mm

I wanna go with the same dish as the PI engines (17cc right) to bring the CR back down

99-00 is 18.5cc
01-04 is 15.8cc

Why do you want to lower compression?

guys who have built forged bottom ends, what'd you use?

Eagles and Diamonds.

 

[SR-71Blackbird]

okay, thanks

Why do you want to lower compression?

would be a waste of time and $$$ to build a forged bottom end and then not SC it, lol

 

[The Great Obucina]

okay, thanks



would be a waste of time and $$$ to build a forged bottom end and then not SC it, lol

then build a bottom end for about a 9ish :1 compression, so you can supercharge it. There is no point in running a forged motor for street use that has low compression.

 

[Burbank 95sc]

That might help a bit.

would be a waste of time and $$$ to build a forged bottom end and then not SC it, lol

My brother has 10.8:1 on 4.6 dohc with vortech blower and is running great so far

 

[SR-71Blackbird]

ya, it'll be above 9:1 for sure...around mid 9


nice chart



wow, 10.8 is pretty high

 

[GreenBird]

Modulars do fine with 9 to 10 CR with boost.

Charts are junk, there are far too many variables, heads vary by +/- 1.5cc alone.

Here is a really good Calculator:
http://not2fast.wryday.com/turbo/compression/compression.shtml

 

[Mod Motor Cat]

I bought mine through Modular Performance

Stock cast crank (reballanced), Manley H-Beam rods with ARP2000 bolts and diamond pistons.

Got the Level I kit myself. I see they're still selling it, but now offer it with ModMax rods, instead of Manleys. Damn near as good. Good enough for moderate power levels under 500-550rwhp anyway. :thumbsup:

 

[JoeyICU]

what about vt stuff, is it as good as names such as eagle, manley, modmax, etc or are they not as durable/reliable

 

[Mod Motor Cat]

For the most part, VTEngines uses Manley rods and Mahle or Diamond pistons. Actually, most aftermarket companies use rebadged Manley Rods. Pretty much any forged rod and/or pistons is going to be an improvement over the stock powdered rods and hypereutectic pistons.

 

[JoeyICU]

For the most part, VTEngines uses Manley rods and Mahle or Diamond pistons. Actually, most aftermarket companies use rebadged Manley Rods. Pretty much any forged rod and/or pistons is going to be an improvement over the stock powdered rods and hypereutectic pistons.

ya, thats what i was figuring, but i was thinking they made there own products, good info

 

[GreenBird]

VT doesn't make anything. Neither do most modular shops. The tooling required is way too expensive. Usually they find a specific manufacturer to make a proprietary product. That's not always a good thing.

 

[JoeyICU]

ya im a buy from the company that made the product kinda guy, it cuts down on prices and sometimes the stuff direct from the manufactur, rather then someone taking the product and rebadging it, is better