Jump to content
hosestop@msn.com

87mm long rod L18 engine any body ?

Recommended Posts

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.

Share this post


Link to post

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

Share this post


Link to post

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....

Share this post


Link to post

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.

Share this post


Link to post

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....

Share this post


Link to post

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.  

Share this post


Link to post

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

Share this post


Link to post

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 !

Share this post


Link to post

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....

Share this post


Link to post

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. 

Share this post


Link to post

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

Share this post


Link to post

Ive been running this combination since 2010. Great little L motor!

  • Like 1

Share this post


Link to post

L18's can even go to 89mm if your machine shop knows what they're doing.

 

The later M2 block has more material, so if you have a choice of blocks, use that one.

Share this post


Link to post

L18's can even go to 89mm if your machine shop knows what they're doing.

 

Mine didn't...

Damn bores are all angled towards the front by .005" on a 6" square.

Idiot Pete Kotzur (Kotzur Racing Engines, San Antonio, TX) didn't have the block setting in the machine evidentially.

Thankfully I checked before putting the head on.

Guessing 'merican V-shit iron isn't effected by piss poor machine work.

 

Now, I either have to try to get someone to straiten them with only a .5mm over bore, and new custom pistons,

or find another L18 block, and start over.

Share this post


Link to post

Need to pick up motor at machine shop , Pistons are below deck and Franklenstein list says .29 below deck with closed chamber head will still be in 9 to one + it says , so I can't wait to assemble , I may put in 521 we recently picked up ! parked 38 yrs will need brake conversion to disc .

Share this post


Link to post

Yeah, I kind of assumed he meant .29mm.

Share this post


Link to post

I have never worked with a machine shop that measured in millimeters. Industry standards in the USA are in inches...dammit.

  • Like 3

Share this post


Link to post

Agree metric , search l18 longrod post from 2009 and fankenstien list also I saw it and was below deck not 5/16 I am committed so it's going together closed head for sure a87 or 219 .99

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×

Important Information

By using this site, you agree to our Terms of Use.