Blown Heads
Melting Slicks
Joined: Jan 2009
Posts: 3,482
Likes: 195
From: folsom california
While any things possible, I can't imagine an 70K engine needing a bottom end rebuild. Pull the heads...which you have to do anyway right? look at the cylinder bores / piston tops for obvious damage, have the heads rebuilt...do a cam swap? if so inclined ? and bolt it back together.
a blown head gasket does not = the need for a new engine.
a blown head gasket does not = the need for a new engine.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
oil pressure switch is in a parallel circuit with fuel pump relay to power fuel pump. There are aftermarket switches with higher psi rating which could protect engine depending on cause of pressure loss.
Very true blown head gaskets in most cases is just a gasket kit and maybe head resurfacing.
Very true blown head gaskets in most cases is just a gasket kit and maybe head resurfacing.
Team Owner
Joined: Jul 2004
Posts: 28,330
Likes: 3,245
From: Hartford WI
oil pressure switch is in a parallel circuit with fuel pump relay to power fuel pump. There are aftermarket switches with higher psi rating which could protect engine depending on cause of pressure loss.
Very true blown head gaskets in most cases is just a gasket kit and maybe head resurfacing.
Very true blown head gaskets in most cases is just a gasket kit and maybe head resurfacing.
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
The engine and fuel system isn't designed to prevent damage actually. blown head ...gasket. Oil pressure switch is designed to come on below 4 1/2 psi normally internal damage will occur before light comes on especially under load. Low coolant can skew cts readings since air does transfer heat like a liquid. Some model have a check gages light to alert driver something is not right. With head gasket failures there is always the potential for more damage. Severe overheating can cause cracked heads, scuffed pistons and cylinders. You really don't know what you got until its apart.
what does scuffed piston or cylinders look like or what are symbols. Just for my own info
thanks
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
if you search scuffed cylinder wall there are images.
the oil switch deal is mostly in racing. Rules will dictate fuel pumps won't run with engine off. Fuel pump prime is on a spring loaded toggle switch designed to be open when released. The factory wiring is altered so that ecm doesn't control fuel pump.
the oil switch deal is mostly in racing. Rules will dictate fuel pumps won't run with engine off. Fuel pump prime is on a spring loaded toggle switch designed to be open when released. The factory wiring is altered so that ecm doesn't control fuel pump.
Thread Starter
Heel & Toe
Joined: Dec 2016
Posts: 19
Likes: 0
While any things possible, I can't imagine an 70K engine needing a bottom end rebuild. Pull the heads...which you have to do anyway right? look at the cylinder bores / piston tops for obvious damage, have the heads rebuilt...do a cam swap? if so inclined ? and bolt it back together.
a blown head gasket does not = the need for a new engine.
a blown head gasket does not = the need for a new engine.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
LT1 is different than the tpi you could get a hot cam match port the heads and intakel. Changing rocker arms to 1.6 change cams personality. I just depends on what you want.
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Team Owner
Joined: Jul 2004
Posts: 28,330
Likes: 3,245
From: Hartford WI
You will need to get one or not modify the car. "computer friendly" cams, aka low bang for the buck are all you can do. Besides, if you do a tune, you can tow it there and get it done and you don't need to do it again until you make radical changes. You can get the mail order tunes or as I like to call, guess work tunes.
Thread Starter
Heel & Toe
Joined: Dec 2016
Posts: 19
Likes: 0
You will need to get one or not modify the car. "computer friendly" cams, aka low bang for the buck are all you can do. Besides, if you do a tune, you can tow it there and get it done and you don't need to do it again until you make radical changes. You can get the mail order tunes or as I like to call, guess work tunes.
Team Owner
Joined: Jul 2004
Posts: 28,330
Likes: 3,245
From: Hartford WI
I'd like to talk to the person writing the tune and see what he thinks would work for what I have and what I plan to do. I'd also make sure that he is doing it dyno tune and not just guessing around at what the tune to write.
Melting Slicks
Joined: Jan 2009
Posts: 3,482
Likes: 195
From: folsom california
cam swaps are always a subject of debate, but I can't believe that there isn't some room for improvement; my LT4 had the stock LT4 cam (which is bigger than an LT1 cam) and it had three wiped lobes, a switch to an LT4 Hot Cam was a big improvement; was it the cam? was it having 16 functional lobes instead of only 13 ? All I know is that both the engine and I were a lot happier. And I've had similar good luck with other engines.
"supporting mods" ? My theory, for what its worth, is pick a cam that will support your goals (torque, horsepower, economy, whatever) install it and work out from there.
There has to be someone who can chime in with some specific cam recommendations for your engine.
Team Owner
Joined: Jul 2004
Posts: 28,330
Likes: 3,245
From: Hartford WI
Kinda like you asking me to build the transmission using your list. You have a problem, I blame the parts. Parts says it is me. This way, you recommended the parts, you bought the parts and it breaks, it's all YOU. Ask me how I know.
Pro
Joined: Mar 2004
Posts: 654
Likes: 18
From: Linthicum MD
I went with a mail order tune from Ed Wright at Fastchip:
http://fastchip.com/
Could not find a dyno tune for my OBD1 anywhere close. His tune was just about spot on for my H/C/I Lt1.
http://fastchip.com/
Could not find a dyno tune for my OBD1 anywhere close. His tune was just about spot on for my H/C/I Lt1.
Team Owner
Joined: Jul 2004
Posts: 28,330
Likes: 3,245
From: Hartford WI
Pro
Joined: Mar 2004
Posts: 654
Likes: 18
From: Linthicum MD
Another option is to use Solomon: http://www.lt1pcmtuning.com/
He reads the wideband info and will send several tunes back based on the results.
Team Owner
Joined: Jul 2004
Posts: 28,330
Likes: 3,245
From: Hartford WI
Wideband. The A/F was just about spot on. It was a tad on the rich side but that is expected from a mail order tune.
Another option is to use Solomon: http://www.lt1pcmtuning.com/
He reads the wideband info and will send several tunes back based on the results.
Another option is to use Solomon: http://www.lt1pcmtuning.com/
He reads the wideband info and will send several tunes back based on the results.