Quad CHT Guages

Plastermaster · Post by **Plastermaster** » Wed Feb 25, 2004 3:18 pm

I know it would be cool to always see what each chamber is doing, but when weighing cost and dash space, What is the likelyhood that 1 cylinder is going to start reading hotter than the others? I know it only takes 1 time to cook something, but what things would cause only 1 to overheat? If something does go wrong in 1 cylinder, would it also show up in a EGT guage? I am thinking maybe 1 CHT and 1 EGT rather than Quad CHT combined with a tach as one 4" guage.

Thanks
Ron

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Wed Feb 25, 2004 3:28 pm

I have seen one cylinder run 100 degrees hotter than the rest with some cooling systems!

a dual CHT and quad EGT is a good thing. EGT really can show you what a cylinder is doing. There is a good chance that if EGT rises something is up with the cylinder and the can effect CHT on the same one..

Class 11 streeter · Post by **Class 11 streeter** » Wed Feb 25, 2004 5:42 pm

Here is an email I sent to Westach about quad CHT gauges recently and their reply:

[email protected] wrote:Questions and Comments: Can Westach build a "quad" CHT automotive gauge in the 3" size? Application is an aircooled Volkswagen and available instrumentation space is understandably small. Thanks Monte

Westach wrote:Hi Monte
Yes we do have a 3" round automotive style quad CHT, 100-700F on all
four. 3CQ1 $222.40 The senders that fit the VW 18mm 712-5WK are $16.60
each. Lighting kit 186 is $4.60.

THANK YOU PETE CORNELIUS TECH SUPPORT WESTBERG MFG. WESTACH
PH 800-400-7024 or 707-938-2121 FX 707-938-4968 http://www.westach.com
See our catalog on-line at http://www.frostalarm.com/cat

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Wed Feb 25, 2004 7:45 pm

I have a 4" model x 3 on the dyno

I have a 3" in the beetle right now doing some TI test work to back up the dyno work!

Plastermaster · Post by **Plastermaster** » Wed Feb 25, 2004 7:59 pm

I hadn't thought of quad EGT, just one after they all merge. Sounds like a good idea though, 1 in each primary.

I know some cooling systems are uneven, but say with the DTM they are all close when they leave your shop, what kind of things cause 1 to get hotter than the others? I guess where I am coming from is for ages the norm has been 1 CHT, and now there is the option for quads. Is it a good idea? Of course it is. How nessacary is it? The guy who could have saved his engine probably wishes he had made the investment. So, I guess I'm trying to get a handle on the likelyhood of 1 cylinder running hot enough to self destruct, when they normally are equal.

Ron

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Wed Feb 25, 2004 8:42 pm

Running lean- clogged main jet will skyrocket a cylinder individually.

Crappy shrouds are the main problem with one cylinder being way hotter than the rest....

A_67vdub · Post by **A_67vdub** » Thu Feb 26, 2004 11:38 am

Jake, do you ever have a problem with the scale (100-700) being too small to see when your driving with the quad guage? I was leaning towards the dual myself, to make it easier to read. On the quad it looks like the scale is about 1" long while on the dual it looks like its about 2". Seems like it would be easier to see with the longer scale.

My plans were to get a dual CHT and a combo oil temp/pressure.

Steve

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Thu Feb 26, 2004 11:41 am

A dual 3" is much bigger.... its easier to see.

Mr. Electric Wizard · Thu Feb 26, 2004 12:06 pm

is there any online info on installing EGT senders in the head vs. the exhaust system where they normall go?
It seems like if your running quad EGT's then it would be installed somewhere between the exhaust valve and the exhaust port...

am I totally off base here???

I'd be all over that if its easy enough to do...

Mr. Electric Wizard · Thu Feb 26, 2004 12:12 pm

Ok, looking at Westach's web site, where do you install the EGT sending unit?

Plastermaster · Post by **Plastermaster** » Thu Feb 26, 2004 1:55 pm

I vote for 1 in ea primary or stub pipe, but I don't have the official answer.

Ron

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Thu Feb 26, 2004 1:59 pm

2.5" from the exhaust prt is where I run mine...

A_67vdub · Post by **A_67vdub** » Thu Feb 26, 2004 3:33 pm

Do you use any kind of special heat resistant wire? Seems it would get all crispy being so close to the exhaust.

Steve

Guest · Post by **Guest** » Fri Feb 27, 2004 3:56 am

I wanna run 4 CHT sensors too. I'm thinking of getting 4 of these:

http://www.westach.com/images/showcase/ ... _Probe.jpg

Which go between the spark plug and head. Anyone have any experience with this type of CHT sender. If it's good enough for the aircraft application it's good enough for me, but I just want to know if there is anyone else out there who's gone this route. It seems one hell of a lot easier than drilling/tapping a hole in the right place on the heads.

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Fri Feb 27, 2004 6:17 am

Yes, thats the ONLY way to run the CHT to have it accurate! It must be under the spark plug!