Water Temp Question and Search doesn't seem to be working??

[Stoker100]

What is the safe range for water temp on an all nic 2.5 EFI?
105 at idle (which I assume idel to be the coolest running condition)
150 at WOT??

Tried to do a search and it kept giving me an error??

Thx!
larry

[Stoker100]

Or just a stupid one?

[MODVP22]

Our all Nic motors never get over 150 degrees. Usually they run about 125, because of no thermostats or washers inthe thermostat housing.
Not to sound like a smart-ass or anything, but have you checked over your water pump impeller, housing, tube lately?

Note: if you;ve runthrough areas with a lot of small debris inthe water, sometims this debris can get sucked into the water passages of the adapter plate and powerhead. This will also plug up thermostats/pop-offs. I've seen it happen, can't hurt to check.

[Stoker100]

I have NO reference, just wanting to know what to target for optimal running.
I have ideas around how to keep the water in the block longer to build heat, just wanted to get opinions on what is the optimal performance operating temps for NIC 2.5s, 260/280 blocks.
From what you say it's 125 deg.

I assume there is a high and low
low I assume would be at idle??? 105deg
WOT would be the hotest??? 125deg

[Lost In Space]

My 280 would run 155 late in the year and if a long run was made it would hit 165. Been like that from 0 hours when new.

[Stoker100]

If you have a stock 280, then they measure head temp, which I beleive is warmer than water temp which I am reading.
I need water temp range

So far I am going with 105 minimum, and 140 max for perfect heat range of WATER TEMP as measured in water at top of head.

waiting to hear more!!!

ld

[sosmerc]

On the stock late-style 280's the horn activates at 180 (head temp sensor).
Why not switch to head temp sensors?
Spec for water pressure is: .4 to .6 at idle.
15 psi @ 7500 rpm
Just thinking out load here, but if you had a cooling system problem the head temp would probably react sooner than water temp...in my opinion anyway. So monitoring head temp might be "safer".
Got to eat my lunch now!
Chow!

[Stoker100]

I have SW gauges 100 to 230, takes a 334F sensor.
Will the 280 head temp sensor work with them??
I test water temp by submerging in water, how do you calibrate headtemp gauge?

thx

[sosmerc]

I test with heat gun and laser temp guage to verify temp.

[sosmerc]

The 280 head temp sensor has a range of .02 to 3.2 kohms (about 100 ohms at 75 degrees.)

[sosmerc]

Lunch over.....back to work now!

[Stoker100]

thx
larry

[LakeRacer99]

I am having similar problem with the search function.

So if the water temp range is about 105-125, what would be the range for head temperatures?

I am using 2 teleflex 120-240 F guages and senders are mounted i the water jackets in to of the heads on my 260. These guages are not really registering anything for me and I was wondering if I was using the correct senders. Maybe I need to switch them to measure the cyl head temp instead.

Thanks,

[Stoker100]

Not sure why, I think it had something to do with the second screen pop not being allowed, sorry I can't be of more help.

I think the water temp on these things never get over 100???
I had a headtemp on the SDS MAD system and it would go from 85 on idle to 130 at 5K. Assuming water temp runs 30 deg cooler, ya never get above 100!

I have heard good head temps are 105 to 120 at idle and up to 160 on WOT
On my 280 with 260 electronics I have threaded holes in the heads (dry). I have found adapters that fit in the holes and then allow my 1/8 pipe threaded senders to thread into them. I have borrowed a good infrared heat measuring device, so I will be testing the acuracy of them this weekend. I have also installed some pop-it type restrictors that should restrict the water flow at idle (building around 12psi) and then opening up at higher flows to get to 15 to 20 at WOT. What I am hoping to acheive is the temps detailed above (idle 105-110) WOT (150-155). This is on my drystacked one peice with the restrictor on each side

I will let you know my findings
ld

[LakeRacer99]

Great thanks Stoker...hopefully we can nail this down.

1. Do any engine builders have a comment on the safe range of cylinder head temps and safe range of water temps?
2. What is the preffered method of measurement?
3. How does dry stacking effect this?
4. Do any of you guys use flow reducers?


JSmith? US1?