Nelson race engines

[anonymous-user]

Most of the stuff is obvious but still worth watching. I certainly agree with his view on strokers

http://speedsociety.com/why-is-the-ls-engine-so-da...

[Mud_]

Enjoyed it, thanks for posting

[ArnieVXR]

My standard deck height LSX427 wore its pistons out due to excessive skirt wear. Pretty extreme environment though TBH. Be interesting to know how long a stroker will run on the street before needing new pistons. Didn't Monkfish build a 416cu stroker for someone several years ago?

Funny that he makes the point that 4" strokers are bad on stock deck heights, when he offers a 402cu twin turbo on his website ( $36,000 )

[stevieturbo]

ArnieVXR said:

My standard deck height LSX427 wore its pistons out due to excessive skirt wear. Pretty extreme environment though TBH. Be interesting to know how long a stroker will run on the street before needing new pistons. Didn't Monkfish build a 416cu stroker for someone several years ago?

Funny that he makes the point that 4" strokers are bad on stock deck heights, when he offers a 402cu twin turbo on his website ( $36,000 )

It's not so much the deck height, as length of the liner/bore. You could re-sleeve with a longer liner like he says the LS7 already is, but still with standard deck height.

On my first 383 which was LS6 block and 4" stroke, I ran it for around 12,000 miles and abused the life out of it for most of that time. The piston skirts whilst polished in the area where they drop out of the bore, were still ok otherwise, likewise shorter mileage on the 403/LS2 after that.

But apparently the iron blocks have shorter liners to start with, so arent always an ideal candidate for a stroker. That said, plenty of builders in the US still offer them and they work ok
Not sure what different piston options they're using though.

[anonymous-user]

Indeed. Iron truck blocks have shorter liners than LS2 for example. On mine I had one piston break up and the other 7 were completely knackered within about 1500 miles. 6 runs at VMax killed it in the end. My LS1 had the same crank and rods but smaller pistons obviously. After about 1000 miles the skirts were polished but at the time I didn't think anything of it. Personally I think it's easier to stay as close to OE as possible.

Still surprising to see how many standard engines destroy themselves albeit with a bit of abuse. I'd hardly call these things bomb proof.

[BartW]

wormus said:

Still surprising to see how many standard engines destroy themselves albeit with a bit of abuse. I'd hardly call these things bomb proof.

Sadly, but completely agree.

[Boosted LS1]

Yes but they run fine in cars that haven't been interfered with. There must be zillions of them out there running happily. The weaknesses are always going to be spark management or to much cylinder pressure. Both kill the stock pistons.

[stevieturbo]

The instances of completely standard engine failures vs those that run reliable would be very very small indeed.

And there is little doubt the engine platform is incredibly strong when you do see how long some standard boosted engines do run for and the power they make.

Yes most standard pistons are a weak link even more so with boost, but the rest of the engine is pretty damn sturdy. Most failures will be down to the tuning aspect or whoever put the thing together than failure of actual components because they were pushed too hard.
Especially when it comes to the smaller 5.3's. They really do beat the st out of them and they just keep going..