counting from the distribution chain onwards and (naturally) starting with 1, which cilinder would be the most critical ,temperature wise on an F20C
logically I would say no;4 is the hottest, the one closest to the firewall, but somehow my gut says no;3

but I need more opinions on this

feed me!

 

I'd say #4 with airflow wise, but..

less airflow = lower AFR = richer mix = lower temp..

Regarding your guess.. I don't see #3 usually get damaged unless it's overrev.. and I don't know why. Heatwise.. no clue

You have an infra-red surface temp reader? Try that on the primaries of your header... =T

 

Don't have an IR temp reader, could get one they are not too expensive
Lambda corrects the fuel via feedback, but that feedback signal is an average of all 4 cilinders ,the average is corrected,so logically that indeed means the last cilinder having the worst airflow, will run the richest of all 4
however cooling wise this cilinder runs closest to the firewall creating a larger heat buildup by the exhaust.

reason for me wanting to know is that I still have those ultracool S.P.A. Design dual digital gauges and I just bought an Thermocouple adapter box and egt probe for it so I can use my Boost/Temp gauge to read the EGT

 

EGT probes would need a bung right? That would usually be on the collector, so the reading would still be an average, unless you're tapping into the primaries.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FR-MOB: Projekt &raquo;</TD></TR><TR><TD CLASS="quote">EGT probes would need a bung right? That would usually be on the collector, so the reading would still be an average, unless you're tapping into the primaries.</TD></TR></TABLE>

correct, but I want to tap it into the primary of my hottest cilinder, hence why I want to figure which cilinder

by the way, I wonder how much heat is lost by radiation if you put the probe into the collector, it has travelled about say 30 inch, but exhaust air velocity is high and heat loss by radiation would occur when the exhaust has fully heated up

bet the differences are neglectable if I use heatwrap

 

Heat wrap or heat coating would help. I'm gonna take a wild stab and say Cylinder #1 would be the hottest.

 

why not make it an actual test; I'm gonna buy that IR temp measuring thingie and make this yet another project

I'm gonna check if summit sells em, and order one, they are always fast in shipping stuff to me

 

Sounds like a good plan. LMK how it goes. I'd like to know the difference between the hottest and coolest cylinders...

 

will keep this topic updated

 

I would have to sa its #1. Every time I take my head off or valve cover the spark plug tube has blue heat marks on it and the spark plug looks like ****.

Also, open up your T/B and take a look at how much air goes to #1. There is a wall that takes up !/2 of the damn intake mani right at the first runner.
Just a thought

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blkturbos2k &raquo;</TD></TR><TR><TD CLASS="quote">I would have to sa its #1. Every time I take my head off or valve cover the spark plug tube has blue heat marks on it and the spark plug looks like ****.

Also, open up your T/B and take a look at how much air goes to #1. There is a wall that takes up !/2 of the damn intake mani right at the first runner.
Just a thought</TD></TR></TABLE>

x2. Also notice how much oil collects there after some hard driving.

 

been ebay shopping for a pyrometer and will have it in a week, will post the results here.

 

solsurvivor its CYLINDER

 

He's Euro-peeing. He has an excuse.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FR-MOB #4: Jerk &raquo;</TD></TR><TR><TD CLASS="quote">solsurvivor its CYLINDER </TD></TR></TABLE>

I have a dutch accent, I'm not to blame........

 

So how do u say it..?


See - LEEN - DAH ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FR-MOB: Projekt &raquo;</TD></TR><TR><TD CLASS="quote">So how do u say it..?


See - LEEN - DAH ?
</TD></TR></TABLE>

hole that does bang

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by solsurvivor &raquo;</TD></TR><TR><TD CLASS="quote">

hole that does bang</TD></TR></TABLE>

I thoroughly love holes that bang. or even holes i bang.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Filliam H. Muffman &raquo;</TD></TR><TR><TD CLASS="quote">

I thoroughly love holes that bang. or even holes i bang. </TD></TR></TABLE>


technically that depends on wich hole you bang

 

due to the firing order, number 3 is the hottest cylinder.

 

1-3-4-2 if I'm correct? Care to explain Mase?

 

so my hunch was right, but indeed why by cause of firing order mase?
I will do the measurements as soon as possible, haven't bought the pyrometer for jack sh*t and it makes a nice test anyhow

 

cilinder 4 3 2 1 intake temp

0min 48 48 49 49 66
1min 300 370 416 420
2min 347 446 553 514
3min 481 436 555 530
4min 580 465 480 563
5min 520 480 550 553
6min 500 435 505 510
7min 480 465 480 475
8min 525 440 490 510
9min 418 460 505 510
10min 410 440 490 485
15min 380 421 465 453 76
1st fan eng
24min 441 487 506 484 70

30min drive 465 510 539 537 122
31 recheck 447 488 499 483 122

looks like cilinder 2, measured with longacre accutech infrared pyrometer in degrees F

 

Good job Sherlock. Now go tap that sh*t... the temp probe that is.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by solsurvivor &raquo;</TD></TR><TR><TD CLASS="quote"> cilinder 4 3 2 1 intake temp

0min 48 48 49 49 66
1min 300 370 416 420
2min 347 446 553 514
3min 481 436 555 530
4min 580 465 480 563
5min 520 480 550 553
6min 500 435 505 510
7min 480 465 480 475
8min 525 440 490 510
9min 418 460 505 510
10min 410 440 490 485
15min 380 421 465 453 76
1st fan eng
24min 441 487 506 484 70

30min drive 465 510 539 537 122
31 recheck 447 488 499 483 122

looks like cilinder 2, measured with longacre accutech infrared pyrometer in degrees F </TD></TR></TABLE>

Nice work! But those temps would be different under load unless you were able to check temperatures while driving. Spa Design makes great gauges good choice. The best way to get an idea of what's going on in each cylinder is to have a thermocouple an 2-3" from each exhaust port on the headers. It would be worth all the trouble if you were tuning each individual cylinder, otherwise it's a lot of effort to get this information.

As far as intake manifold design, it's designed to distribute airflow evenly from #1 to #4.