destroking

i HAVE BEEN TRYING TO GET INFORMATION ON destroking the g54b. I have an 87 conquest tsi, I would love to destroke her and get some higher revs out of her. does anyone have any pertinent information on options?

Do you mean the 2.6 liter Mitsu? (I don't understand your secret code numbers)
Put a 2.0 liter crank in a 2.6 block and you get 2.4 liters. JVL has done this before so he knows all the ins and outs and what have yous.

Doivi Clarkinen Wrote:
-------------------------------------------------------
> Do you mean the 2.6 liter Mitsu? (I don't
> understand your secret code numbers)
> Put a 2.0 liter crank in a 2.6 block and you get
> 2.4 liters. JVL has done this before so he knows
> all the ins and outs and what have yous.


It's too easy.

2,0 Crank at 90mm, bore a 2,6 block from 91,1 to 92mm gives you like 2392cc and 92 x 90
with moderate lift cams it's non-interference.
Flat tops are available in forged at 92mm for non customs, bigger gotta go custom.

The motors share the same block deck height and same rods, so when using the 2,0 crank, you use pistons with the 2,0 compression height.

It really is nice when it's all fresh.

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

Yeah, like JVL said.

You can even save your OEM short block as it is. Just get another 2.6L (G54b) block from a D50 or a Starion (really,really cheap) and destroke that one. JVL can source some really cheap forged pistons for you that will give you about 8.1 compression. Your existing head, flywheel, and all the bolt-on's will swap right over.

Rich Smith

sorry about the delay. yes the g54b 2.6l mitsubishi. That is great info, so basically I can use the 2.0 crank, and the 2.6 pistons and rods; "is that correct?" and I can even go for higher compression pistons? That sounds lovely if I got that right. i happen to have two spare starion blocks collecting space. Are there any better options for heads or is the stock one, or magna one the best there is?

where can I source the g52 or 51 crank from "the 2.0" ?

absolute Wrote:
-------------------------------------------------------
> where can I source the g52 or 51 crank from "the
> 2.0" ?

At better junk yards Nationwide.

But first you must acertain exactly which block you will be using.
The are 2 main bearing sizes, early Large and later smaller.

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

so which one should I use? the larger or smaller?and how would I know the difference? Or I would need to know what exactly to get

absolute Wrote:
-------------------------------------------------------
> so which one should I use? the larger or
> smaller?and how would I know the difference? Or I
> would need to know what exactly to get

You need to know what your current block has.
Only you can tell us that.

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

absolute Wrote:
-------------------------------------------------------
> so which one should I use? the larger or
> smaller?and how would I know the difference? Or I
> would need to know what exactly to get


Victor,

Here is an example of a reground 2.0L Crankshaft Kit available right now from an eBay vendor ($140 + $50 shipping):

Ebay Item No. 270222884161

You are going to need to do your own homework to find out if the 2.362" main bearing journals on this crank match your Starion engine. Start with the published specifications for your car... and then MEASURE your 2.6L crank to verify.

Early G54 & G52 engines (1970's) have the larger journals. Later engines (1980's) have the smaller journals. But there are anomalies, especially in the 2.0L (G52) engines. Mitsubishi made these engines for almost 20 years and put them in everything from forklifts to Starions. So make sure you MEASURE.

As far as heads go, just start with what you've got and change the camshaft to suit your target performance. You can always replace it later if you want to. There are earlier 2-valve heads with solid rockers, but the ports are smaller. There are later 3-valve heads with solid rockers... usually found in Minivans.

My opinion is that your destroked engine will spool up fast if you do something about a flywheel that's lighter than OEM. But I would still lean toward building the engine for torque rather than super-high RPM. The engine can hold the torque, but may have difficulty staying together at sustained high RPM. If it was me I'd build a street or rallycar to stay under 6,000.

Rich Smith

Hendrik Block run 2800cc and won the championship.
Lon Peterson run 2700cc and won the championship.
Ken Smith run 2750cc and won the championship.
What was the Question?

---

- RWD rocks -

Topi Wrote:
-------------------------------------------------------
> Hendrik Block run 2800cc and won the
> championship.
> Lon Peterson run 2700cc and won the championship.
> Ken Smith run 2750cc and won the championship.
> What was the Question?
>
> Member of Swedish "Fart Förening"


Yeah, imagine that. No turbo's and short wheelbases too!

Rich Smith

Topi Wrote:
-------------------------------------------------------
> Hendrik Block run 2800cc and won the
> championship.
> Lon Peterson run 2700cc and won the championship.
> Ken Smith run 2750cc and won the championship.
> What was the Question?

Something wrong with a little mix-n-match of parts to make the motor
MORE FUCKIN FUN????


>
> Member of Swedish "Fart Förening"

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

> Topi Wrote:
> --------------------------------------------------

> > Ken Smith run 2750cc and won the
> championship.
> > What was the Question?


Topi, you do mean 2-750cc Saab engines right, which means 1500cc as in the Monster?
,

---

As always IMHO

SEAN TENNIS KF7JJR
SEATTLE, WASHINGTON
SAAB 99, SAAB 850
SAAB V4, SAAB 99T

absolute Wrote:
-------------------------------------------------------
> That is great info, so basically I
> can use the 2.0 crank, and the 2.6 pistons and
> rods; "is that correct?"


Victor,

To clarify your questions:

- Yes, you can use the 2.0L crank.
- Yes, you can use either 2.6L or 2.0L rods. (They're identical)
- No, you can't use OEM 2.6L pistons. You must get new pistons.

Call JVL to source cheap Forged Pistons.

Rich Smith