Damaged LS1 engine on just purchaced HSV GTO 2002.

[peter b]

I hope it's one of these, actually I want to quad supercharge (thats 4x power!!), do you have any in stock?

hahahahaha plenty mate plenty lol

[HZute-efi-VS5L]

While I can see why you want to keep the blower... If I were you I would "fix" it, then sell it... Then buy a harrop

Cheers for the input. Why a harrop? Why not keep the Raptor. Just interested to know peoples reasoning. Not just them saying they are not suited. Cheers!

[HZute-efi-VS5L]

Ok something intersting today.

Pulled the coolant bottle off to fit a coolant sensor. why it doesnt have one who knows.... (aftermarket allu one)

In the bottle there was about 1/4 of a cup of sticky clear silicone!!!!
So obviously it was not a decent shop that pulled off the heads. They must have used half a tube of the crap! WHY........
So its throught everything! radiator I guess. EVERYTHING.

I wonder could it have caused a blockage and number 6 and 8 got hot at some stage? It was running very cool and has since I have had it.

[Tom333]

bloody criminal what some people will do to an engine.

Don't know much about the raptor superchargers build quality but I reckon you're coping grief about it because it's a "baby supercharger" that was really build for a smaller engine like a V6. They sort of remind me of the PD blower from a few years ago that maxed out at 4PSI or something.

If you like the power the raptor gives you then keep it however if you do increase the engine capacity during your rebuild, be mindful that the Raptor will really run out of puff towards the top end of the rev range. You don't want to find out later on that you have to get a larger supercharger and then bigger injectors and then a fuel system upgrade.

Personally if it was my car, I'd just get a new LS1 crate motor replacement, get rid of all the silicone, put everything back the way it was and enjoy. Clearly you purchased the car because you liked how it drove and the power output.
That would be your cheapest option IMHO and best bang for buck.

[VYSHSV8]

If you ever run your car lean in an ls1 it will be no8 that goes first, from what I have read and heard over the yrs


iPhone in the middle of no where

[Tom333]

Even so wouldn't the knock sensors kick in before detonation became severe enough to damage the piston/s?

[peter b]

Even so wouldn't the knock sensors kick in before detonation became severe enough to damage the piston/s?

With boost and cast pistons no necessarily it doesn't have to take a long time for it to go pop

[Tom333]

7 PSI or whatever the little Raptor Supercharger can push in is a pretty safe level of boost for a stock motor and I'd only expect it to max out at 7 PSI high up in the rev range. I was under the impression the stock LS1 could cope with 10 PSI safely. I doubt Chevs would have put an agressive tune into it too.
I'm getting 9 PSI on my stock LS1 (only changed valve springs) with a Harrop HTV1900 with no knock.
Getting the impression this car has had the sh!t thrashed out of it by a previous owner...

[peter b]

7 PSI or whatever the little Raptor Supercharger can push in is a pretty safe level of boost for a stock motor and I'd only expect it to max out at 7 PSI high up in the rev range. I was under the impression the stock LS1 could cope with 10 PSI safely. I doubt Chevs would have put an agressive tune into it too.
I'm getting 9 PSI on my stock LS1 (only changed valve springs) with a Harrop HTV1900 with no knock.
Getting the impression this car has had the sh!t thrashed out of it by a previous owner...

yeah but there are quite a few factors it not as simple as say just thrw boost and it will handle it there is more to the story here. He had issues with broken fuel lines and he also ran it on 95 octane when it is tuned on 98 may not seem like much but with boost you dont get a lot of leeway. Considering the pistons are cast and not forged or hyper pistons they are not very forgiving.
You say safe level but for an engine that was never designed for boost and pistons that were only ever designed for Natural aspirated etc when fitting a blower you are putting those pistons under more pressure. There is no such thing as oh it only low boost she'll be right if there are issues in the tune or other issues with the car it will go pop end of story no amount of knock sensors will save it

[Tom333]

valid points peter. cheers.

[Tom333]

Which Raptor Supercharger do you have? The V or the R?

[jboy21]

Raptors need to be serviced quite a bit. The internal belt shits itself after a while.

[zorro]

He had issues with broken fuel lines and he also ran it on 95 octane when it is tuned on 98 may not seem like much but with boost you dont get a lot of leeway.

And the fact that the amount of tunes I have looked at with the low spark map being a straight copy/paste of the high spark map doesn't help.

Who knows without actually knowing what went on in it's life. This is a case of bad luck which only the OP can benefit from by getting it rebuilt and reliable with the setup he wants.

[poolkeeper]

Cheers for the input. Why a harrop? Why not keep the Raptor. Just interested to know peoples reasoning. Not just them saying they are not suited. Cheers!

Just the fact that shops constantly fit harrop blowers, good numbers, build quality, nicely engineered piece of gear...

[Wonky]

By coincidence the guy who previously owned the car came in to see Chev for advice on his current car while I was here getting my front camera moved. He said in the time he'd had the car (he was not original owner) the heads had never been off and Chev certainly didn't have them off, so sounds like any head related issues go back to a/the previous owner.