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1G Enginetech vs. Evergreen pistons

dwb

Proven Member
238
103
Sep 9, 2021
Broomfield, Colorado
I'm curious if anyone has opinions or experience with either Enginetech or Evergreen pistons as an 1g OE replacement? I'm looking for a set for my 1g/6bolt turbo engine with stock fuel trims. I know there's other options out there like Topline, NPR/Nippon, and Silv-O-Lite. I've not heard good things about Topline (broken ring land and porous material seem common), available NPRs seem to be 2g specific, and Silv-O-Lite I have no data. I'm reusing my 1g rods but my machinist won't machine them to 22mm so that limits my options. I could take the rods elsewhere but not my first choice. I want to try to stick with 21mm pin if possible.

Here's a list of the 1g 6 bolt part numbers I've come up with:
EnginetechNPREvergreenToplineSilv-O-Lite
P4546(4) / rings: C8532411-546PSBR5005LPAMI6T9123H

And the kits I'm looking at:
Evergreen
Enginetech
 

Dericsh

Supporting Member
1,333
563
Nov 25, 2002
Pearl River, Louisiana
I have no experience with either, hopefully you can find someone who does. My suggestion would be to get new rods or a new machinist so you can use proven parts in your build.
 

Spleen8urLSX

Proven Member
133
85
Dec 26, 2017
Elyria, Ohio
Never heard such a thing out of Topline. NPR, Topline, “Nippon Racing”, ITM, and Engine Tech are all the same exact piston out of the same factory, and on top of that it’s also the same factory the original ones came out of, with that being said I’m sure it’s the same case for Evergreen, they simply left the Mitsubishi logo off for the aftermarket. I always tell people when buying stock replacement pistons for these simply go with whatever is the right size you need for the best price as you’re getting the same thing regardless of who’s name is on the box. As far as someone having issues with Topline pistons breaking the ring lands, that’s a tuning error if not a machining or assembly error.
 

CrackedDSM

10+ Year Contributor
2,018
682
Dec 17, 2009
Pensacola, Florida
Honestly the more I hear about your machinist the more I would STRONGLY suggest going somewhere else. First he makes a typo saying he’s gonna bore the block out to 86.5mm from 85.0, and now he refuses to do a simple 21 to 22mm bore job? A student fresh out of school could do it.

What if this dude “forgets” a spec for your rebuild, or makes a typo on the tolerances on a bearing and locks the engine up?

Red flags for days. But like OP said above all of them are the same manufacturer’s pistons. I’d grab a set of NPR 2G pistons and find another more trustworthy machinist. Increased compression, nice thick 1g, great combo.
 

dwb

Proven Member
238
103
Sep 9, 2021
Broomfield, Colorado
Honestly the more I hear about your machinist the more I would STRONGLY suggest going somewhere else. First he makes a typo saying he’s gonna bore the block out to 86.5mm from 85.0, and now he refuses to do a simple 21 to 22mm bore job? A student fresh out of school could do it.

What if this dude “forgets” a spec for your rebuild, or makes a typo on the tolerances on a bearing and locks the engine up?

Red flags for days. But like OP said above all of them are the same manufacturer’s pistons. I’d grab a set of NPR 2G pistons and find another more trustworthy machinist. Increased compression, nice thick 1g, great combo.
I'm questioning this as well. It's a shop that typically does V8s but advertise the DSM 4g63 as well. I'm 11 weeks in after he quoted 6-8 and he's just now getting it on the mill due to workload. It hasn't been a pleasant experience.

You're right, he did quote the wrong bore size and I had to call him out on it. I asked him about milling the rods and he said "I would not bore the 21mm rods to 22mm, imo that’s asking for trouble as the rod gets thinner." I don't think he realizes how beefy these 1g rods really are. He's probably never even seen one.

Another thing this shop has me baffled about - they want the pistons in-house before the final bore because "All pistons have a tolerance So before finishing, the pistons need to be in house. Nominal size is 85.5 (3.3661) Ive seen pistons come in almost that big and the block ended up bigger" I have no idea if this is true or not. Can anyone chime in about this?
 

Spleen8urLSX

Proven Member
133
85
Dec 26, 2017
Elyria, Ohio
Honestly the more I hear about your machinist the more I would STRONGLY suggest going somewhere else. First he makes a typo saying he’s gonna bore the block out to 86.5mm from 85.0, and now he refuses to do a simple 21 to 22mm bore job? A student fresh out of school could do it.

What if this dude “forgets” a spec for your rebuild, or makes a typo on the tolerances on a bearing and locks the engine up?

Red flags for days. But like OP said above all of them are the same manufacturer’s pistons. I’d grab a set of NPR 2G pistons and find another more trustworthy machinist. Increased compression, nice thick 1g, great combo.

This! Even using 1g pistons, I hate
I'm questioning this as well. It's a shop that typically does V8s but advertise the DSM 4g63 as well. I'm 11 weeks in after he quoted 6-8 and he's just now getting it on the mill due to workload. It hasn't been a pleasant experience.

You're right, he did quote the wrong bore size and I had to call him out on it. I asked him about milling the rods and he said "I would not bore the 21mm rods to 22mm, imo that’s asking for trouble as the rod gets thinner." I don't think he realizes how beefy these 1g rods really are. He's probably never even seen one.

Another thing this shop has me baffled about - they want the pistons in-house before the final bore because "All pistons have a tolerance So before finishing, the pistons need to be in house. Nominal size is 85.5 (3.3661) Ive seen pistons come in almost that big and the block ended up bigger" I have no idea if this is true or not. Can anyone chime in about this?
Thats typical on the pistons, many machinist’s like to bore to the size using the pistons that will be used. However, the rest of it tells they have no hands on with 4g63’s. I’d pay for any work they’ve already done and take it elsewhere. Hopefully he hasn’t actually machined it yet. I’m a machinist for a living myself, however I don’t work with engines, I will say if he made a “typo” of 86.5mm that was likely on whatever paperwork he was going to go off of and he likely would’ve milled it to that. I’d stay far away.
 

dwb

Proven Member
238
103
Sep 9, 2021
Broomfield, Colorado
Ugh, you guys aren't making me feel any better :cry:
TBH, if I yanked my stuff today I'd be right back in the same boat. Unknown machinist and a waitlist 3 months out.
 

Spleen8urLSX

Proven Member
133
85
Dec 26, 2017
Elyria, Ohio
Ugh, you guys aren't making me feel any better :cry:
TBH, if I yanked my stuff today I'd be right back in the same boat. Unknown machinist and a waitlist 3 months out.
Unfortunately (as I’m sure you know) that’s every machine shop anymore with the wait time. However there’s still options, they could very well do the machining correctly but I’d triple check their work and in no way shape or form allow them to do the assembly. But keep in mind, even if you don’t have someone close it could be well worth the few hours to drive to someone reputable or well worth the extra cost to ship it out to someone reputable. There are plenty of reputable engine builders who work with 4g63’s who customers ship engines to, and also with that being said there’s plenty of good machinists out there who don’t specialize in 4g’s but are more than capable of doing the work well. Someone who was ready to ram the cylinders out to 86.5mm until you corrected them is not one of those machinists. In fact, most machinists in a typical situation aren’t willing to start doing any boring on the cylinders until they have the pistons you want to use in hand, as going the other way it would be just as easy for a customer to tell the machine shop 86.5mm then be completely wrong and blame the machine shop for ruining their block.
 

dwb

Proven Member
238
103
Sep 9, 2021
Broomfield, Colorado
they could very well do the machining correctly but I’d triple check their work and in no way shape or form allow them to do the assembly.

It's a pretty reputable shop from what I've heard but they specialize in V8 race engines. Unfortunately it doesn't seem like he's seen many 4g's. No way will any shop assemble it.

I'll find out what he's done. In the meantime I'm just going to buy some 2g NPR/Nippon pistons. Enough with the 1g pistons to fit the rods bs. I can easily find another machine shop to do the rods.
 

Spleen8urLSX

Proven Member
133
85
Dec 26, 2017
Elyria, Ohio
It's a pretty reputable shop from what I've heard but they specialize in V8 race engines. Unfortunately it doesn't seem like he's seen many 4g's. No way will any shop assemble it.

I'll find out what he's done. In the meantime I'm just going to buy some 2g NPR/Nippon pistons. Enough with the 1g pistons to fit the rods bs. I can easily find another machine shop to do the rods.
I’d stick to them then if they don’t have a reputation for failures. Like you said, plenty of other shops can bore the rods to accept the 22mm pins and if everything measures out properly when you get it back you should be good. Worst case scenario they screw it up, but if you catch it they might be willing to make it right or fix it at that point too.
 

1990TSIAWDTALON

Moderator
9,440
5,268
Nov 14, 2013
Independence, Kansas
It's a pretty reputable shop from what I've heard but they specialize in V8 race engines. Unfortunately it doesn't seem like he's seen many 4g's. No way will any shop assemble it.

I'll find out what he's done. In the meantime I'm just going to buy some 2g NPR/Nippon pistons. Enough with the 1g pistons to fit the rods bs. I can easily find another machine shop to do the rods.
These motors are NOT hard to assemble correctly. If you can do one, you should be able to do them all. Just sayin. I'm an old V8 guy but they are all just correct tolerances with correct parts. I can build them all, surely an "experienced" shop can do the same. Be cautious.
 

dwb

Proven Member
238
103
Sep 9, 2021
Broomfield, Colorado
These motors are NOT hard to assemble correctly. If you can do one, you should be able to do them all. Just sayin. I'm an old V8 guy but they are all just correct tolerances with correct parts. I can build them all, surely an "experienced" shop can do the same. Be cautious.
I'm doing all the assembly myself.:D (so I hope you're right):thumb:
 

CrackedDSM

10+ Year Contributor
2,018
682
Dec 17, 2009
Pensacola, Florida
It’s honestly very easy, and to be honest at least for me personally, one of my most favorite things to do ever. Especially on an OEM style rebuild.


And it’s rewarding. When it runs and it kicks a** for another 200,000 miles you can puff your chest out and say I built that.


It’s like the first time you do CPR and get ROSC/person comes back alive. Lol.
 
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