7MGE and ITB's?

**haison** · 04-09-2007, 08:05 PM

Goddamn it rob. You've planted some evil ideas in my head...

ed · 04-09-2007, 08:11 PM

i have big pics of the hydro GT linked above somewhere
damn site went goofy and i lost a few of the bigger images

use the gtr throttles @ 45mm - cheapest and easiest to set up, port spacing is good, and installation height is minimal

will reply to your PM shortly

ed

**RObErT_RaTh** · 04-09-2007, 08:31 PM

Originally Posted by haison

Goddamn it rob. You've planted some evil ideas in my head...

Hey, someone else planted them in mine first! I'm just sharing the thought

Originally Posted by ed_jza80

use the gtr throttles @ 45mm - cheapest and easiest to set up, port spacing is good, and installation height is minimal

will reply to your PM shortly

Noted, thanks for that Ed

**gianttomato** · 05-09-2007, 11:23 AM

Originally Posted by RObErT_RaTh

Cheers again GT

The 7MGE ones I believe are stock 60mm and that's just one so I'm sure 6x 43mm would still be plenty for what I need

Not about supply but it's about runner length and velocity. Do the calcs - 45 mm is the best compromise. 43mm will very likely be too small if you end up tweeking the motor.

Completely forgot about the GTR throttle option - cheapest by far. You can pick up the plates from SAU forums for about $150. Same concept regarding fabrication of a manifold.

**haison** · 05-09-2007, 11:29 AM

Question about putting shorter stroke cranks into an engine.
Can't seem to get my head around this, the dude in the first post used a 5MGE bottom end with a 7M head. I'm wondering if you use a 5M crank in a 7M block (seeing as it has the oil squirters) you would have to use the longer 5M rods right?

Ugh i think i just answered my own question typing it out..

**gianttomato** · 05-09-2007, 11:39 AM

No idea why it is being done - WOFTAM. Yep, you'd probably need to use the 5M rods - but I can't be sure - check the deck height and go from there.

There is a loss of compression - reduced swept volume - so you'd need to get new pistons made to get the comp back up.

Just stick with the 7M or ditch the now 40 year design and get a 2JZGE. If you really want a smaller capacity I6, use a 1JZGE - they're practically being throw away.

**Screamn_Sleeka** · 05-09-2007, 11:44 AM

5m bottom end is used because its got a shorter stroke, less torque but higher RPM potential.

ed · 05-09-2007, 11:46 AM

i would NEVER destroke an engine under the assumption that you gain something back in revs...

wrong wrong wrong

**thechuckster** · 05-09-2007, 11:53 AM

if you were running/racing in a category that required retaining the original block but allowed induction/head changes - then it might make sense to put 7mge head onto 5/6m block? But that's pretty damn unlikely to occur.

But my gut feeling is that they're avoiding some kind of engineering approval by retaining the block but putting a much better head onto the motor.

**haison** · 05-09-2007, 11:55 AM

hokay std 7m bottom end it is.

**Steve M** · 06-09-2007, 11:11 PM

Blacktop ITB's don't have a round bore where they mount onto the manifold. It would be annoying to match to a manifold.
Silvertop ones do have a round bore.

**The Real Roadrunner** · 06-09-2007, 11:47 PM

Originally Posted by ed_jza80

i would NEVER destroke an engine under the assumption that you gain something back in revs...

wrong wrong wrong

i dont think they would do it for the revs thing but more to build a long rod motor, ie get a set of longer rods made to bring the ve up in the top end of the rpm range.
this would also allow higher revs @ the same piston speeds also.

but i agree with what your saying i would prefer a big cube torque monster over a revvier engine

but its all personal preference

cheers
linden

gtr throttles are close to dcoe spacing but the studs are in a different pos from memory.

**Hydra** · 06-09-2007, 11:52 PM

I wish I hadn't looked at this thread, it reminds me how much I want to see 6TB's hanging off a 2JZ in my car.

**abently** · 07-09-2007, 11:40 AM

It may be wise to find out what the exact flow gains are. I know that on a full-race N/A 1UZFE, ITB's only allow 15% better flow than the standard Manifold, so in that case (for street use) it would be wiser to just have the stock Manifold Extrude honed and/or larger t/b then to mess about with ITB's.

**The Real Roadrunner** · 07-09-2007, 12:43 PM

Originally Posted by abently

It may be wise to find out what the exact flow gains are. I know that on a full-race N/A 1UZFE, ITB's only allow 15% better flow than the standard Manifold, so in that case (for street use) it would be wiser to just have the stock Manifold Extrude honed and/or larger t/b then to mess about with ITB's.

try telling ed that and he might think twice about the money hes just wasted