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87mm long rod L18 engine any body ?


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#1 hosestop@msn.com

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Posted 10 January 2018 - 11:50 AM

Hey out there I am about to bore an L18 to 87mm Z22 pistons and L16 long rods been wanting to do this 2mm is a lot ,the machinist is concerned Nissan comp book said you can go 3mm ouch.

#2 datzenmike

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Posted 10 January 2018 - 12:01 PM

It's only 1mm of actual material  removed from the cylinder wall. 0.040". 


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#3 Crashtd420

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Posted 10 January 2018 - 12:10 PM

Hey out there I am about to bore an L18 to 87mm Z22 pistons and L16 long rods been wanting to do this 2mm is a lot ,the machinist is concerned Nissan comp book said you can go 3mm ouch.


I heard it's not really a problem but I was told it would be a good Idea to have the block sonic tested for cracks....
Might be worth it looking into just to be sure....

#4 G-Duax

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Posted 10 January 2018 - 12:21 PM

I have mine bored to 88mm, and I see a few of them bored to 89mm in Japan.

But I also did a half fill with HardBlock, to support the bores.

Did mine with custom pistons, and 140mm (FJ length) rods.



#5 Crashtd420

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Posted 10 January 2018 - 12:36 PM

I have mine bored to 88mm, and I see a few of them bored to 89mm in Japan.
But I also did a half fill with HardBlock, to support the bores.
Did mine with custom pistons, and 140mm (FJ length) rods.


I was gonna say don't the lseries nismo head gaskets go up to 89mm....

#6 distributorguy

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Posted 10 January 2018 - 01:01 PM

The Nismo gasket is good for about 88.5" piston size.  At 89 I'd be afraid of hitting it after torque, as the one I have on the shelf measures 88.9 uncrushed.  



#7 banzai510(hainz)

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Posted 10 January 2018 - 01:17 PM

yes you can go 87mm

I went 83 to 85 on my L16.

 

I dont see what your getting at with this motor, get a L or Z 22 block


Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#8 hosestop@msn.com

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Posted 10 January 2018 - 02:21 PM

Nissan comp manual said to sonic test if exceed 2 mm so that is ok ,showed machinist.

#9 hosestop@msn.com

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Posted 10 January 2018 - 03:06 PM

yes you can go 87mm
I went 83 to 85 on my L16.
 
I dont see what your getting at with this motor, get a L or Z 22 block

78mm stroke by 87mm bore 1855 cc interesting short stroke !

#10 Crashtd420

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Posted 10 January 2018 - 03:28 PM

The Nismo gasket is good for about 88.5" piston size. At 89 I'd be afraid of hitting it after torque, as the one I have on the shelf measures 88.9 uncrushed.

Ya 88mm is probably max what nismo says is the safe limit for the block ... you definately don't wanna hit the head gasket....

#11 datzenmike

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Posted 10 January 2018 - 05:43 PM

You can't hit the HG with an L18 because the piston doesn't go high enough, however an exposed fire ring will get hot enough to become an ignition source and it will erode away and fail. 


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#12 hosestop@msn.com

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Posted 11 January 2018 - 12:30 PM

I have a few Nismo head gaskets stashed , I will make sure it is close to 87mm , Also Mike I left this part out the L18 has an O ringed block for a turbo in the day or high compression motor .( I will take some pics when bback from machine shop) considering a 219 with a fat cam can't decide was going SU for a good driver but now considering some 45mm webers but my daughter has to drive during summer vacation from college, I recently inherited a 69 4dr that this set up is going in now has full suspension and 5spd. 1968 rear clip.will post oucs.wQ6i2Kw.jpgOlssg9w.jpg