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[Mk2] [Turbo] Looks To Nice I need some help
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androo007
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1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Wed Jun 28, 2017 4:37 pm    Post subject: Reply with quote Reply with quote including images

I'm always on the hunt, never seem to find them! [Twisted Evil]
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rev2rich
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1991 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Sat Jul 01, 2017 3:56 pm    Post subject: Reply with quote Reply with quote including images

So the 5 block has been delivered and ever thing looks good... so should I go the 2.2 route and just get done or stay 2. [thumleft]

Are their any down side if going the 2.2 route? As in rev limated ect

Cheers Rich
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C35Rob
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1996 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Sat Jul 01, 2017 5:19 pm    Post subject: Reply with quote Reply with quote including images

rev2rich wrote:
So the 5 block has been delivered and ever thing looks good... so should I go the 2.2 route and just get done or stay 2. [thumleft]

Are their any down side if going the 2.2 route? As in rev limated ect

Cheers Rich


Generally speaking;

Longer stroke = worse rod/stroke ratio, higher piston speeds so increased wear, higher bearing loading, greater piston side loading and friction, less keen to rev as hard as a shorter stroke motor but better low down torque, and obviously the extra 200cc is a bonus.

Short stroke = the exact opposite of longer stroke.

I'm not aware of many (only one off the top of my head in the UK) who have built a 5s block up with a 3s crank, but if I were in the position you were in that's what I'd do - 86mm stroke 3s crank and 87.5mm pistons to give you a 2069cc motor, However other people's opinions may vary.
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ashley
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PostPosted: Sat Jul 01, 2017 8:30 pm    Post subject: Reply with quote Reply with quote including images

xx

Last edited by ashley on Fri Jul 07, 2017 9:35 pm; edited 1 time in total
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rev2rich
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1991 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Sun Jul 02, 2017 9:55 am    Post subject: Reply with quote Reply with quote including images

Thanks for the Imput lots to think about... I do like the high rev 3's crank I have at the minate and it is already knifed edge balanced so makes more sense to use and my set up currently is making 400whp and comes In nice and early

I will keep hold of the 5s crank as I probably want more power in the future so a 2.2 will make it a nicer build and would cut down on the lag of a bigger turbo

Suppose any one want to give me a parts list I would need as I currently have brand new every thing on the engine and would want to reuse as much as possible

[thumleft]

Cheers rich
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rev2rich
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1991 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Thu Jul 06, 2017 7:18 pm    Post subject: Reply with quote Reply with quote including images

So with further inspection the block is not repairable so time to crack on with the 5s block.. [thumleft]
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androo007
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1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Fri Jul 07, 2017 9:20 pm    Post subject: Reply with quote Reply with quote including images

Rich the only other option you have is to use a 98+ NA block. Keeps 3s with the strengthened waterpump area. Just needs oil feed for turbo tapping.

An option if you wanted to reuse all the 3s parts.
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