Right, another oil squirters question, however this one is a little different.
I have searched heaps of forums and threads and the opinions are pretty divided whether or not oil squirters are necessary. I still don't know what to believe, nevertheless if my block had oil squirters, I'd run them but I'm in the process of building a forged engine using an Airtrek block which has oil squirters in the factory conrods. I'll be using Nitto H beam conrods and Mahle Performance pistons which are 4043, not 2618 so keep that in mind.

I understand oil squirters cool the piston and alot of people believe you don't need them with forged pistons, I'm more concerned about oil supply to the small end as the Nitto conrod (and most aftermarket rods) do not have an oil channel from the big end to the small end, instead Nitto have 2 oil supply holes on either side of the small end which I'd imagine gets its oil from splash, same as the sleeves. This would be the same setup when using an Evo 4G63 with aftermarket conrods and blocking off the oil squirters.

This seems to be the setup when using aftermarket rods in an RB30 which doesn't have oil squirters either so this must just be adequate supply to the small end.

Anyone able to share experience?
Airtrek topics/info are not common, let alone specific information regarding aftermarket rods etc.

I'm looking at 3 options
1. Run no oil squirters
2. Drill and tap block for evo squirters although I can't seem to find them, and from what I've read, they have their own risks involved such as check valve failures, bolts backing out, nozzles cracking etc. Then there is cost/risk involved drilling and tapping the block.
3. Drill the main journal in a similar fashion to some of the early DSM 4g63, although they had a check valve and prone to clogging. This is also done on some LS engines too, believe its called "bulkhead style". I wouldn't be able to install a check valve so it would be always open, essentially 4 controlled leaks. This is risky.

Am I overthinking small end oil supply? Yes there is the piston cooling factor too so chime in if you have some first hand experience please.

Appreciate it.
Jake

 

I have seen quite a few airtrek turbo blocks and your's appears to be an exception. Are we taking an airtrek turbo or non turbo block. The airtrek turbo block comes with the oil squinter in the block like some of the older DSM 4g63. The NA might have it in the conrod. Have not paid attention much to the NA blocks.

 

Jakey - is it a turbo Airtrek engine or NA?
Turbo will have oil squirters in the block, drilled into the side of the mains tunnel.

Typically small end bearings get fed oil from the piston oil ring, when they scrape off the bore it gets channeled to the small end.

 

Appreciate the responses.

After many pieces of info put together, it's definitely an NA block, so question now becomes whether or not to add oil squirters or run without them and use the Haltech to put safeties in place for oil temp, coolant temp, and well tuned knock control.