Piston Sleeve Or Bore To 87mm On Rb26dett?

[RTFGTR]

Hi,

It's been ages since I have posted on the forum... I need some advise to get my car back on the road. Please excuse if I get the jargon incorrect, I will try to be as accurate as possible.

A while back (cough.. 4 months) I munched piston #6

After investigation (first time head has come off) all pistons are @ 86.5mm - cylinder #6 has a score to 86.7mm. (more on the thrust side if that makes a difference)

Now, I have been told that it may not be good idea to bore to 87mm on the RB26??? Also been told that sleeving can disrupt or distort cylinder #5 - can someone please give me advise on this and if it is possible. My other option is to get a new or second hand block? Is this worth while or can my engine be saved as is? Arias have a pistons up to 87mm

Thanks in advance.

Robin

[blind_elk]

FWIW, I'm pretty sure 87mm is a "standard" 1mm overbore, which is within factory tolerance (Nissan will gladly sell you 87mm pistons to suit a RB26DETT). There should be no problem boring to accommodate 87mm pistons.

[Mik]

FWIW, I'm pretty sure 87mm is a "standard" 1mm overbore, which is within factory tolerance (Nissan will gladly sell you 87mm pistons to suit a RB26DETT). There should be no problem boring to accommodate 87mm pistons.

<{POST_SNAPBACK}>

87mm is fine..but are you sure the nores are already 86.5mm? Did you measure them?

[hungry6]

So what really happens when you sleeve the bores? For argument sake, that you used some decent sleeve and not just any machined down old steel pipe.

[RTFGTR]

FWIW, I'm pretty sure 87mm is a "standard" 1mm overbore, which is within factory tolerance (Nissan will gladly sell you 87mm pistons to suit a RB26DETT). There should be no problem boring to accommodate 87mm pistons.

<{POST_SNAPBACK}>

Thank you for your help.

[RTFGTR]

87mm is fine..but are you sure the nores are already 86.5mm? Did you measure them?

<{POST_SNAPBACK}>

I have had the pistons measured @ 86.5 (aftermarket) and nores to 86.7mm or there abouts - the motor had larger pistons placed in prior to me getting the car from Japan (I'm still to find out what else has been done to it, it will be stipped down over the next week or so)

[ylwgtr2]

i bored mine out at 87mm....no dramas yet

[Duncan]

And I sleeved one of my cylinders, no problems with that either. A sleeve is generally stronger than the original bore

[Sydneykid]

The Nismo Z Tune R34GTR runs 87mm bore.

cheers

[Bass Junky]

Get ylwgtr2 to Knife edge your crank!!

*drools*

[Mik]

I have had the pistons measured @ 86.5 (aftermarket) and nores to 86.7mm or there abouts - the motor had larger pistons placed in prior to me getting the car from Japan (I'm still to find out what else has been done to it, it will be stipped down over the next week or so)

<{POST_SNAPBACK}>

Fair enough, the only reason I asked is that I have seen 86mm RB26 pistons that have '05' on the top (as well as the 05U). The '05' was some sort of casting ID mark.

The 86.5mm nissan pistons have '50' at the fron where the piston grade ID normally is.

[GTR-Ben]

I have a spare set of 87mm GTR pistons sitting in the garage, good as new if anyone is interested..

[RTFGTR]

I have a spare set of 87mm GTR pistons sitting in the garage, good as new if anyone is interested..

<{POST_SNAPBACK}>

How much? Are they new? Brand?

I was thinking of getting the Arias for $1070 + GST

[RTFGTR]

Get ylwgtr2 to Knife edge your crank!!

*drools*

<{POST_SNAPBACK}>

Peter, long time no type / speak.

I remember at the last club meeting I attended I had a good chat to ylwgtr2 about the problems I was having after PI - he hit the nail on the head and said DONT DRIVE IT, get it checked out ASAP - what did I do... take it on a drive to Lakes Entrance that weekend and the rest is history.

After he slaps me around the head a few times... How much you reckon he will charge to knife edge my crank shaft? Is it balanced and polished after also?

[Ronin 09]

mr ylwgtr2 is very busy these days