Boost induced valve float?
maybe. I wasn’t looking at my afr gauge do that’s a mystery to me too. It’s usually in the low 11’s, high 10’s at 22lbs so hopefully it was in that area. I’m gonna make some time this weekend and get the heads off. I’ll start draining coolant tonight. That’s my most dreadful thing of the whole process. I’m trying to think what I can do while it’s apart to make things better. Might get the proper bore size gasket. Right now I’m running ls9 gaskets. I was trying to find some used head studs too.
TECH Regular
Joined: Sep 2019
Posts: 405
Likes: 19
BCN- I live in the south and it’s a PickNPull place and it’s busy 6 days a week nonstop and they have been there since early 90’s and have a awesome rep and give you 30day free returns even on engines. I’m still working on it.
Ok who guessed tuliped valves? But get this, the intake side tuliped. I think I know why tho. I’d rather not say why, to be honest.
I bought some $58 “stainless” valves off eBay because I couldn’t find ferrea at the time, or maybe I was being cheap. I guess I should have at least bought a name brand. I did it to myself. AGAIN.
I bought some $58 “stainless” valves off eBay because I couldn’t find ferrea at the time, or maybe I was being cheap. I guess I should have at least bought a name brand. I did it to myself. AGAIN.
Ok who guessed tuliped valves? But get this, the intake side tuliped. I think I know why tho. I’d rather not say why, to be honest.
I bought some $58 “stainless” valves off eBay because I couldn’t find ferrea at the time, or maybe I was being cheap. I guess I should have at least bought a name brand. I did it to myself. AGAIN.
I bought some $58 “stainless” valves off eBay because I couldn’t find ferrea at the time, or maybe I was being cheap. I guess I should have at least bought a name brand. I did it to myself. AGAIN.
yep. You were right.
should I.....
put stock intake valves back in?
put ferrea valves in?
ferrea hollow stem?
or manly race flo?
or these? They state that are coated and for high temps.
https://www.ebay.com/itm/LS1-Chevy-2....c100005.m1851
should I.....
put stock intake valves back in?
put ferrea valves in?
ferrea hollow stem?
or manly race flo?
or these? They state that are coated and for high temps.
https://www.ebay.com/itm/LS1-Chevy-2....c100005.m1851
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Verdad Gallardo I hope you guys don’t mind. I’m going to create another thread about these cheap chinesium valves, warning people do not use them with boost. They would have been ok for a while I guess in a na application, but the face that contacts the seat was showing wear already. So I’d say the metal was way too soft.
but would you say the failure was more a result of being a cheap valve, because the intake side did it and the exhaust valves are ferrea. I would think the exhaust would definitely be hotter....
9 Second Club
Joined: Nov 2003
Posts: 13,616
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From: Norn Iron
The exhaust will be hotter...but it's also a lot smaller, and a damn sight stronger.
I've tuliped intakes myself, but that may be one of the risks in pushing too hard on pump fuel and sustained hard use...ie mile sorta thing.
On pump keep it on the richer side, keep timing sensible etc etc. There are just no benefits from trying too lean, or too much timing. And by too lean I mean even mid 11's, unless it's very low boost
As to whether there are potential valvetrain causes or not....maybe there are some factors there too, but not that I can think of.
I've tuliped intakes myself, but that may be one of the risks in pushing too hard on pump fuel and sustained hard use...ie mile sorta thing.
On pump keep it on the richer side, keep timing sensible etc etc. There are just no benefits from trying too lean, or too much timing. And by too lean I mean even mid 11's, unless it's very low boost
As to whether there are potential valvetrain causes or not....maybe there are some factors there too, but not that I can think of.