vortec 350 with ramjet cam

[s10]

OK I think I have a tune issue but the guy at pcm for less doesn't think that's the issue I started off with a stock 98 vortex motor blew it up so built a .03 over 350 eagle crank rods speed pro .125 popup pistons ram jet cam reused the heads 1.6 roller rockers had pcm for less tune the computer the motor ran hot so I put be cool radiator changed heads to dart 74 CC to drop the compression back to 10.1 changed to tpi injection.so I would have injectors instead of popits still same isue could this issue be in the tune the plug look right don't look like its running to lean I'm lost not sure what to do any ideas

[EagleMark]

Got a data log to look at?

[s10]

No and I don't no anyone that can do it for me he told me he had 27 degree timing at idle and I think he said it was in the 40s at wot this is my first go around with efi but that's way to much timing for a Carb motor with that cam

[Lextech]

Is there any way that the water pump is turning the wrong direction? (Wrong pump/pulley/belt routing)

Jeff

[s10]

No all that's right new pump new radiator all that I didn't have this over heat issue till the cam and tune change its cold natured cuts out till motor warms up has tons of power great throttle responce just runs to hot when u put it under a heavy load its in an s10 off road truck so its usaly on trails around 2500 rpm mabie 15 miles an hour at that speed and rpm takes about ten minutes its at 220 230 u can bring the rpm up to 4500 or so while driving 25 or 30 MPH it will hold the 200 or 210 Max that's why I think its in the tune but like I said this is my first efu build so I really don't no what to do

[Lextech]

I know you said it happened after the cam and tune but, maybe that is just a coincidence. Is it possible that since the engine now makes (should make) more power that the radiator can't support it. OR--Can you shoot the radiator with an infra-red thermometer? I have seen radiators that were partially plugged and would cause overheating. Look for areas that are substantially cooler than the rest of the rad.

[s10]

Tryed all that replaced radiator with a new becool and I flow fans swapt the water pump even took the trans off the radiator put it by itself

[Lextech]

Hhmmm. I don't know.

[lionelhutz]

Doesn't being lean or too much timing advance cause overheating?

Did you check the timing was correct and that the fuel pressure was correct?

I said this is my first efu build so I really don't no what to do

If you are going to mess with your own EFI builds then you need to be capable of scanning the computer and understanding the data so you can use it to assist with troubleshooting. That is what you need to do. Right now, you're just blindly spending money and swapping parts guessing at what might fix it. It even helps for something as simple as looking at the scanner or computer spark advance number and comparing that with the real advance measured using a timing light.

I really have no sympathy for people that want to fix or troubleshoot EFI systems but refuse to use the scan port....

[dave w]

Doesn't being lean or too much timing advance cause overheating?

Did you check the timing was correct and that the fuel pressure was correct?




If you are going to mess with your own EFI builds then you need to be capable of scanning the computer and understanding the data so you can use it to assist with troubleshooting. That is what you need to do. Right now, you're just blindly spending money and swapping parts guessing at what might fix it. It even helps for something as simple as looking at the scanner or computer spark advance number and comparing that with the real advance measured using a timing light.

I really have no sympathy for people that want to fix or troubleshoot EFI systems but refuse to use the scan port....

Sotra harsh comment.

I use the name Old School EFi and the logo of a School Bus for my company. The back story to my company name goes like this...there is lots to learn about EFi, so get on the bus and learn. Not a harsh comment, but still to the point.

dave w

[delcowizzid]

not enough timing at cruise rpm makes heat too.im allways trying to get the carby v8 guys to hook there vacuam advance back up when they all start complaining they cant keep temps down.
you need to get a laptop and cable and get inside its brain and see whats being commanded in there

[brian617]

Cracked head? Vortec heads notorious for cracks.

[Hog]

Cracked head? Vortec heads notorious for cracks.

He's running Dart heads.

Ramjet 350/HT383 cam is pretty mild and when used in the HT383 will run fine without PCM tuning.
The calibration would have to be so far off to overheat.

How are you getting your coolant temps? Like Lextech, I'd get an infra red temp gun and go over the entire cooking system. Anyway to get this truck up to speed? Are you running fan shrouds?

peace
Hog

[brian617]

He's running Dart heads.

I guess I missed that.. my bad

[gregs78cam]

not enough timing at cruise rpm makes heat too.im allways trying to get the carby v8 guys to hook there vacuam advance back up when they all start complaining they cant keep temps down.
you need to get a laptop and cable and get inside its brain and see whats being commanded in there

^+1