what cylinder should i install my pyrometers in
 

what cylinder should i install my pyrometers in on bbc 577 n/a's?
what temp should i be running wfo ? thx, in advance. ratman

Re: what cylinder should i install my pyrometers in
 

I had gaffrigs in mine lightning headers in # 7&#8 but the sucked because they read 1500plus degrees all the time when on plane,I added more fuel to get them down to 1250degrees and boat ran like a turd,fouled plugs etc,Smitty

Re: what cylinder should i install my pyrometers in
 

i have one for each engine...whitch hole tends to run hottest on bbc? thx in advance, ratman

Re: what cylinder should i install my pyrometers in
 

ttt

Re: what cylinder should i install my pyrometers in
 

I would use them as a guide only.
type of Intake plays a roll aswell as N/A or forced induction.

N/A Cyl 7 would be the leaner.
However if you are gonna reuse this exhaust for roots
supercharging you may take that into consideration.
Flip a roots supercharger and see it feeds the back cylinders first which would make the front cylinders lean. The
way the carbs sit on top of the roots also plays a roll on it
I would not go over 1350F
My front cylinders run the leanest

# 2 # 7 would be the choice

remember the lower the CR the higher the EGTs
the higher the CR the lower the EGTs
the leaner A/F Ratio the higher EGTs
the richer A/F Ratio the lower EGTs

Hope this helps
Oh put the thermo couple as close to the head as possible
READ THE PLUGS!
Gerry

Re: what cylinder should i install my pyrometers in
 

I would dyno the engines and find out your hottest cylinders.

Re: what cylinder should i install my pyrometers in
 

#2 on a merc dual plane intake motor, on any other type intake it could be any. My dyno results with port matched merlin single plane gave very even egt's. BUT that was with dyno headers.

Re: what cylinder should i install my pyrometers in
 

JCPERF You should put one in your Avitar it looks pretty hot.
Well over 1500F :D

Re: what cylinder should i install my pyrometers in
 

:evilb: :evilb:

Re: what cylinder should i install my pyrometers in
 

I ran them in 5 and or 7

Re: what cylinder should i install my pyrometers in
 

JC, i did dyno them but the shop said the pyrometers break all the time and they don't use them...this is a shop that sells a lot of hi hp blower motors...go figure
i went there figuring they would do a good job on my motors. i paid 800.00 for the dyno time 9 mins on one engine 5 on the other...i put a stop pay on my check for 730.00 i am going to send him another 100.00 bucks and i'm done. i don't think he had a whole lot of respect for my engines, the oil couldn't have been up to temp and i really wanted him to relash my lifters and he blew me off on doing that as well. in all the whole deal sucked, it was for enough from home i had to spend 2 nights in a hotel on top of what i paid for the dyno time.

Re: what cylinder should i install my pyrometers in
 

With a dart intake and a procharger #2 & #7 melted on mine so thats where my probes are at. 1350 deg is my top temps as well. Greg