how far can you bore a tundra block

[ChrisSC400]

well ive been reading about project lextreme alot and i was thinking about doing somewhat the same stuff..however i wanted to go bigger bore. how far can i bore this block out to but still be safe to run pretty hefty amout of boost..and how many liters will it come out to...

thanks

chris

 

[Zuffen]

The cylinder liners are only 2mm wall thickness.

Boring is out of the question unless you want to re-sleeve with aftermarket, or Chevy, liners

 

[Lextreme II]

Max for FI would be .020", NA .025"

 

[ChrisSC400]

even with resleving it only .020 over?

 

[Lextreme II]

http://www.lextreme.com/3uzblock.html

 

[ChrisSC400]

isn't the tundra a 2UZ?

 

[Red Supra]

Right, i was thinking the same thing. The steel block should be able to take 40-over with ease.

 

[Lextreme II]

Red,

How much increase with 40-over? I talked to my engine builder he stated that he can increase from the 3.31" to 3.51" stroke. I assume the 40 over would be from 3.700" to 3.740" right?

40 over:
That will bring the 2uzfe to 320.77 Cubic Inch.

0 over:
Stock bore and stroke is 317.34 cubic inch.

Stroke from 3.31" to 3.51":
This will bring the cubic inch to 336.51

40 over with 3.51":
This combo will bring cubic inch to 340.15

Not much increase and it will weaken the block too. http://lextreme.com/stroke.html

 

[Red Supra]

I don't belive that a .40 thousand overbore on a steel tunda block will weaken it. Even a stock bore steel motor will split it's liners with enough power.
I do agree that a .40 thou overbore won't give a noticable power difference. I wish somone would make a bigger stroke crankshaft that does not cost an arm and a leg.

 

[Lextreme II]

I was qoued for about $1,000 for the increase from 3.31" to 3.50"

 

[ChrisSC400]

hey lex does the stroke change when you have to grind down the crank shaft to make the chevy rods fit?

 

[ChrisSC400]

hey lex whats the beauty of a 2UZ and why cant i use my 1UZ for this motor build what does the 2UZ have that the 1UZ have besides the bore and stroke i can put the tundra crank in with some little bit larger pistons than the tundra and i can still have the 6 bolt main..whats the difference?

 

[Lextreme II]

Material.... Iron Vs. Aluminum....

 

[ChrisSC400]

i thought the 1UZ was aluminum but i wasn't sure cool well thanks for confirming that. i just got a job at a machine shop and we get really good deals on ross pistions and JE pistons so it looks like that im going to start this engine build within 2 months gotta do some more research first...

thanks for the help

chris

 

[rarson]

I wouldn't go with JE's... slap slap slap...

 

[Lextreme II]

JE are too busy and they are too big for small guys like us. Their customer service is very bad.

 

[ChrisSC400]

what about some low compression chevy pistions it will be less machine work for the pins and stuff like that???

 

[Lextreme II]

Wont not work....

 

[milnersXcoupe]

Is this Right >?

Red,

How much increase with 40-over? I talked to my engine builder he stated that he can increase from the 3.31" to 3.51" stroke. I assume the 40 over would be from 3.700" to 3.740" right?

40 over:
That will bring the 2uzfe to 320.77 Cubic Inch.

0 over:
Stock bore and stroke is 317.34 cubic inch.

Stroke from 3.31" to 3.51":
This will bring the cubic inch to 336.51

40 over with 3.51":
This combo will bring cubic inch to 340.15

Not much increase and it will weaken the block too. http://lextreme.com/stroke.html

2UZ FE 0 over:

stock bore and stock stroke = 284.5 cu.in.


Best way to increase displacement is by using smaller journal Chevy or 'HONDA' sized big ends.


This will yeild 8mm + 84.074mm = 92.074mm or 3.62496063 inch stroke.


3.70 x 3.70 x 3.62496063 x .7854 x 8 = 286.52651609063328 cu.in. 4.7


FORD Cobra engines use stroke changes rather than larger bore increases.


Their 'standard' 4.6 / 5.4 bore is 3.55 inch vs our 4.7 bore of 3.70 inch .


I do like the sound of their 3.8" stroke 5.0 engine alot !