Bongo Fury

How much did you drain out and how much have you put back in? In the present ambient temperatures 5 degree variance idle Vs running to me is not bad - my gauge sits at about 1/4 running and 1/3 at idle ( heater off & air con on) in town

I gave it a good flush through
Quite a few times
So not sure howmuch

Not tried it today
Will have more time tomorrow

Mines the same as Roosmith's 92 -98, tm2 set at 105 as well using G12 antifreeze.

Head temp on my V6 is typically 85 - 90 with alarm set at 95 as I've had it pretty close at times. When on a run, the coolant temp averages 25 lower than the head which shows the radiator is doing it's job.

Simon Jones wrote:Head temp on my V6 is typically 85 - 90 with alarm set at 95 as I've had it pretty close at times. When on a run, the coolant temp averages 25 lower than the head which shows the radiator is doing it's job.

How do you measure the coolant temperature.

Does that mean that the coolant has a running temperature of 60-65..

Gasy wrote:What colour / age is your antifreeze roo
Where is your temp sensor fitted
There does seem to be a temp range from 80c to low 90c with different bongos

Colour is red, age not too sure if I'm honest but over 2 years! The temp sensor is at the back of the engine (exactly where indicated to put it in Haydn's pictures) (no I can't remember where that is!!)

teenmal wrote:

Simon Jones wrote:Head temp on my V6 is typically 85 - 90 with alarm set at 95 as I've had it pretty close at times. When on a run, the coolant temp averages 25 lower than the head which shows the radiator is doing it's job.

How do you measure the coolant temperature.

Does that mean that the coolant has a running temperature of 60-65..

I have a TM2 on the hose where it enters the block on its return journey from the rad. The temp of the water going to the rad will be much closer to the head / block temperature. I'm probably going to reconfigure my TM2 to monitor one of the two heads (as they both run at much the same temp) & change the twin TM4 such that I can monitor what comes out & goes in to the engine.

Simon Jones wrote:

teenmal wrote:

Simon Jones wrote:Head temp on my V6 is typically 85 - 90 with alarm set at 95 as I've had it pretty close at times. When on a run, the coolant temp averages 25 lower than the head which shows the radiator is doing it's job.

How do you measure the coolant temperature.

Does that mean that the coolant has a running temperature of 60-65..

I have a TM2 on the hose where it enters the block on its return journey from the rad. The temp of the water going to the rad will be much closer to the head / block temperature. I'm probably going to reconfigure my TM2 to monitor one of the two heads (as they both run at much the same temp) & change the twin TM4 such that I can monitor what comes out & goes in to the engine.

Ah you are monitoring the Cooled Coolant, very unusual. That is probably why the 25 degree difference, personally I don't see the purpose of measuring the cooled coolant.

Well I think I'm back in love with my bongo
Just went to pick kids up on a run 81-84c
In traffic 86-90c
I'm happy with that

I have a temp gauge strapped to the bottom hose were it enters bottom of rad as well
I know this won't be giving the exact temp of the coolant as it's on the outside
But it's a change in temp I look for
Before this it was always at 34c did change a bit you could see when stat opend
During theses probs it was 44-60c even maxing out which is 75c
Now I'm back to 34 at bottom of rad

She is a good girl after all
Gonna change her oil for fully synth this weekend as a treat

I know this is an old post but I read that increasing the antifreeze mix will increase the engine running temp. A weaker mix will make the engine run cooler. Is this right?

There does appear to be a correlation: http://www.marinemechanic.com/site/page39.html

Mine's quite a strong mix although it doesn't seem to have affected the running temperature according to the various gauges.

Just been looking at effects of antifreeze cooling and if you had 100% antifreeze and reduced to a mix of 25% antifreeze 75% water there would be a reduction in running temperature of up to 20 deg f

Mines settled down about 3 or 4 days after this
And is now running slightly lower temp than before I changed coolant
Head temp on a normal run is now 81.9

al & chris wrote:I know this is an old post but I read that increasing the antifreeze mix will increase the engine running temp. A weaker mix will make the engine run cooler. Is this right?

Yes - racers often use straight water in their engines due to its better heat transference.
I go for the weakest mix I can get away with, usually aiming for the antifreeze mix to work until around -20C.

Tony x wrote:

al & chris wrote:I know this is an old post but I read that increasing the antifreeze mix will increase the engine running temp. A weaker mix will make the engine run cooler. Is this right?

Yes - racers often use straight water in their engines due to its better heat transference.
I go for the weakest mix I can get away with, usually aiming for the antifreeze mix to work until around -20C.

Don't forget the anti corrosion protection. I don't think racers bother too much about it.