Blake

We have worked with Hewitt Industries to manufacture a rotary-specific Dual EGT (Exhaust Gas Temperature) kit just for us. This is similar to the standard dual EGT kits except the temp goes up to 2,000 degrees F and the display is marked F & R (Front & Rear) instead of L & R (Left & Right). You cannot buy it anywhere but through us. We retail the Dual EGT Kit for $250, including Inconel thermocuples and all the wiring. For a group buy, we can do $225 for 5 or more orders, $215 for 10 or more orders and $199 for 20 or more orders. Shipping will be a flat $8.10 anywhere in the USA via USPS Priority Flat Rate Box. International shipping at actual cost.

Why would you want a Dual EGT? First of all Exhaust Gas Temperature is a proven means of engine tuning feedback, similar to wide-band oxygen sensors. Not only does it give you a good indication of rich or lean Air/Fuel Ratio, but also feedback on advancing and retarding ignition timing (something WBO2 cannot do). There will always be a debate about which is better: WBO2 or EGT, but Dual EGT is on a whole different level. By comparing the EGT of both rotors simultaneously, you can judge the balance of combustion; not just the average of two rotors. This knowlege can save your motor!

Believe it or not, our rotors do not usually flow equally. A 13B-REW, for example, tends to run lean on the front rotor at low load/RPM and then goes lean on the rear rotor at high load/RPM. An oxygen sensor or single EGT will only tell you the average of the two rotors, perhaps leading to a false sense of security. With Dual EGT, you can see the imbalance and tune for the leanest chamber. This is a great compliment to Wide Band O2 tuning.

The temp range of this kit makes it ideal for both turbo and non-turbo rotary engines, which tend to run hotter than normal EGT gauges can read. And now, we finally have a Dual EGT Kit marked F & R instead of L & R!

If you are interested in participating in a Group Buy, please post your name (real or screen) below. If there appears to be enough interest, I will get the permission to make it happen, then start taking deposits...Probably $50, to ensure there are no pretenders. The deadline can be July 31st or August 15th, or whatever. Let me know what sounds like a practical cut-off. The sooner it is, the sooner you get the EGTs, the longer it is, the price may get better if more people sign up. Once the cut-off-date is reached, the price is locked in, no matter how many people come forward after that. I will hold the GB open after the cut-off date for a week or two (at the price determined at the cut-off date), then stop accepting orders. After the cut-off date, orders will be shipped as the payments are received. The maximum number of orders accepted will be 25. If we reach 25, then the GB is closed to further orders, even if the cut-off date is not reached. Deposits are not refundable and only can be applied to the purchase of a Dual EGT Kit.

Please let people in your corner of the Forum know about the potential GB. It is applicable to all rotaries, both turbo and non-turbo...though the turbo guys are the ones who need it most.

Blake

Forgot to say that the kit comes with both band clamps and screw-in adaptors, so the non-turbo guys can band clamp the thermocouple adaptor to their headers and the turbo guys can drill and tap their manifold for the adaptors.

dhcernese

one - Dan Cernese; FD; Need gauge before 11-Sep.

afgmoto1978

iTrader: (6)

Blake I'm interested

Blake

Great. Go forth and recruit more people from your corners of the forum. I can't go spamming the forum as a vendor, so the burden is on you guys to spread the word to those who might be interested.

Dan: if you -- or anybody else -- needs an EGT Kit right away, I can sell one to you at the normal retail price (still a smoking deal at $250+Shipping) and if the GB sales add up to meet one of the price breaks, I can then refund the difference to you at that time. In this case, there will have to be a deadline where the price break is frozen. So, for example, if we set a GB deadline of October 15th, on that date the number of participants who have either paid in full or made a deposit are counted up, the discount set and any refunds owed are made. The GB may or may not remain open after that date, but the discount is frozen no matter how many more people come forward. Only those people who identify themselves as GB participants *before* ordering will be eligible for the discounted price.

Moto: gotcha. Same deal...go find more people and we can make this happen.

nozone30

Yeah im in for this also...if we can get 5 people that want to do it fast would anybody mind not getting the $10 discount for the 5 extra people... anyways I'm in the ASAP group :-)

dubulup

And used with a Haltech you can trim each rotor

this is truely SWEET!!!

but how do they show readings above 1600F?? looks like the needle won't be visible??

have any pictures at WOT? Can you get one?

dhcernese

I've been looking at the photo and wondering the same thing. It doesn't look right.. ..the pivot point for the needle is high.

ninjarx7

What is the color of the Dual EGT gauge backlight?

FCrocious

iTrader: (1)

can this be logged with the haltech?

Blake

Trust us, it works fine. This is the same basic unit that has been manufactured and sold for aviation use for perhaps 20 years, with the exception of the temp range and "F" & "R" markings. The back part of the needle moves down as the needle tip moves up, with the pivot point about where the 1500 degree mark is. When the gauge reads 1500 degrees, the butt-end and tip are level. When the gauge reads 2000 degrees, the butt-end is as far below the pivot point as it is high when the gauge reads zero. I understand it seems weird for it to pivot somewhere other than the butt-end, but if you bend up a paperclip, I'm sure you can figure out how they did that.

dubulup

maybe it rides the "groove to ~1600 then rides the edge to the top? more on a linear track than a rotation. I've never seen one like this...just guessing.

Blake

The bulb that comes with it is white, but you can get replacement back-lights in other colors. If there is enough interest, we can start stocking those too.

Blake

Possibly. EGT signals are pretty weak, so the gauge is very sensitive if any voltage is drawn off. A truly digital system should be compatible, according to the manufacturer, but it is best to test back-to-back to be sure. If there is an error induced by the datalogging, it will likely be linear and repeatable, so you can just account for the difference as long as you know what is happening.

It may also be possible to just use the probes with your Haltech, if you have enough inputs and outputs. I will have to check, but it's probably just a 5v signal, so if you give it a reference voltage it will return a corresponding voltage for the temp. Don't quote me on that, however. I need to check. We can sell the probes separately for, I think, $35 each. These are the nice Inconel ones, BTW.

dubulup

YayeR

That'd be most excellent

Blake

Okay, I know this is hurting your brain, so here is a clue. Bend a paperclip to look like this...



It should look like a question mark with a flat top that sticks way out. The top represents the needle, the bottom is the pivot, down inside the gauge. Now, put your index finger and thumb on the bottom, look down on it from the top and twirl the paperclip. Observe the needle tip moving in the opposite direction as the butt-end. The butt-end does not move as far as the needle tip because it is closer to the pivot. Does that make sense now?

dubulup

no need to be a smartass...there are others in this thread who are wondering about the same thing.



it "appears" the indicator will move below this edge...how does it indicate the +1600F areas?

that is my question

Blake

Who is being a smartass? You are the one who just can't seem to understand the explanations I have already given, so I drew you a picture.

Okay, I think I see the disconnect. Look at the needles...do you see the painted ends at the bottom? Those are the TIPS. The pivot at the other end of the needle, near the middle of the gauge. The tips move UP the display from the bottom to the top. If you look at the illustration in my last post, that would represent the needle on the right.

Do you understand now?

Blake

Here is another illustration to help you understand how it works.



Okay, this just illustrates the movement of one of the needles, for clarity. I just photochopped in the needle in different positions as it goes from the bottom to the top. The other one is a mirror image.

dubulup

okay...I gotcha, somehow I missed this post(I think we posted near the same time, I and didn't go back far enough)...that's why I read the above post as smartass, sorry my apologies and nice paper clip model.

and the last picture is exactly what I was looking for!! The black part of the indicator looked like part of the dial...a lip of some sort, where 1600-2000F is on another surface with solid white indicator needles underneath...make sense?!? Illusion.

that is exactly what any modified rotary needs for accurate tuning!! I'm sold...where do I sign up.

Mr. Stock

I am interested in getting one.
Thanks.
Ed

Blake

Okay, no problem. Glad we figured out what the confusion was.

So far, these are the interested parties:

(1) dhcernes (Dan Cernese)
(2) afgmoto1978 (Adam)
(3) nozone30
(4) dubulup
(5) Mr. Stock

Looks like enough interest to get permission for the GB and make this official. Any thoughts on a deadline? Like I said earlier, I can take full payments, ship the kits and then do a refund of the balance when the final buy-in is determined. Or, we can do deposits and then take the balance of the payment when the discount is established and ship all at once (or in a narrow window of time, as final payments come in). I know Dan needs one quickly...anyone else?

scrubolio

iTrader: (8)

hmm, ive been looking for an EGT guage, and this one is cheaper than the defi one and more useful, count me in

Blake

(1) dhcernes (Dan Cernese)
(2) afgmoto1978 (Adam)
(3) nozone30
(4) dubulup
(5) Mr. Stock (Ed)
(6) scrubolio