Well after blowing a head gasket and removing the head i found out i melted a nice chunk of the head from the water passage to the cylinder. I was having detonation in some of the cylinders, some of the thread inserts for the plugs were melted along with a plug completely melted. This was all with a 12.0 airfuel pretty much across the board pushing 21lbs of boost. After speaking with my machinist who is going to try and fix the head he said 12.0 airfuel is too high. He recomends 10.8. for my situation and said i need to add egt sensors, wideband airfuel and datalog my runs. What kind of egt setups are out there for a 8 probe setup. I would really like to monitor all cylinders. I have a nice chunk of change invested in my truck and would like to see it as safe as possible.

 

I'm looking at runnng two 2-channel pyrometers to a common gauge with a switch so that I can replay any of the four. I intend to put a bung in each header tube and research for the hottest 4, then permanently monitor those. I have not seen an off-the-shelf 8 channel, but I was originally going to run a TC switch, but they are too damn big.

Herb

 

http://www.biondoracing.com/DataRecorders.shtml

Just found this one capable to 8 probes, a little pricey but maybe worth it.
Once u link the site scroll down ,the unit says red alert on it.

 

The egt probes on ebay ar dirt cheap. I got 2 of them for $25, they even had pressure fitting and mini type k thermocouple connects.

 

How acurate are they? Any links to the one you went with. Thanx

 

There used scientific probes, I would imagine there more accurate than what comes with most EGT gauges. The one's I got even measures outside temps rather well, but there calibrated to really monitor temps over 200 degrees. A volt meter with temp reader capabilities is required to use these probes. Fluke makes a real nice dual channel one called a Fluke 52. Eventialy I will buy one to complete my system.

Just do a search for "EGT Probes" or Type K Thermocouples.
I built a whole kit for around $150 that consist of 1 air probes, 2 egt probes, 2 liquid probes and all the connects, switch panels and steel braided lines from Ebay and Omega.

Here's the guy I bought my probes from.
http://cgi.ebay.com/ws/eBayISAPI.dll...name=rvi:1:3v_

Make sure to pay attention to his comment "The tip will measure 0f to 1650f. note that the wire is potted into the other end, and that end can only go up to 300f. you will get readings below 0f, but they would be less accurate"

We basically need the temp range between 900 - 1,400 degrees for measuring gas temps, so these would be perfect. EGT temp probes are calibrated for high temps. The Watlow probes are about 10 degrees off on temps under 300 degrees. Above there pretty much very accurate.

 

Here's my completed system.

 

From someone who has been there....if your machinist is going to fix your cylinder head and if that involves welding....I wouldn't. It has nothing to do with the person doing the welding or there technique....it has to do with the head itself. Without going into a lot of detail....I wouldn't weld.
Dale

 

chim-

noticed your power level in your sig. what size pulleys do you run to make 21psi? Are those stock heads?

i have the MP with an 8# lower / 2.7 upper and see 16.5-17 psi on ported heads. i make approx. same power level @ 11.4:1 AF.

Mr. T

PS. Bad as L knows what he's talking 'bout....

 

Dale,
Still waiting on a phone call from my machinist but he also said it might not be worth it to fix. What kind of problems did u run into? Details please?

 

Mr T,
Im running the same pulley combo as u with JLP stage II cnc ported heads and cams.Full exuasht. Maybe your seeing alot of belt slippage.
Jason

 

Doubt it. i've got Charles' idler brace and not much belt dust under the hood. Dyno graphs suggest little slippage either. I find our differences very surprising. We have the exact same JLP head set up (and full exhaust) too.

Have you spoke to JLP about this?

BTW- what kind of ET's and trap speeds are you seeing?

Mr. T

 

time to upgrade those fuel rails. and fuel system. there's a huge difference in how your fuel system works from the dyno and the track. you may be seeing those a/f's due to some cylinders are running rich to compensate the lean conditions in the others.

is the driverside head the worst/burnt one?

 

Havent pulled the drivers side yet,i will be shortly to upgrade the gasket but in the meantime i only pulled the passenger side. I have true dual and was only smoking from the one side so thats the side i pulled first. I hear you on the fuel rail and lines. I have the pump upgrade already. Once i get it set up with the egt and wideband i think i'll be able to really tune it out. I'm also looking into a tunning setup. How did that sniper system work out for you and how capable is it to tune.
Jason

 

Never thought it was an issue to call Johhny about but now you make me think. Never did get it to the track with the MP setup .Hopefully soon.What kind of #s did you put down?
Jason