Welcome to my nightmare

[WATERWINGS]

Been trying to break in my fresh rebuild, at first with poppet and thermostats, 15 PSI of water pressure at idle, off the guage at 3000 RPM's, but did get the temp up to about 125-130 degrees, but TO MUCH PRESSURE!!

I've tried everything from poppet with thermo's, poppet without thermo's, no poppet and quarters with 1/8" holes, poppet and nothing in thermo' holes, nothing at all in poppet or thermo' holes, and I still can't get the temp to reach any more than 120 degrees.

Most folks ahve trouble with not enough pressure, and to much heat........not me, (this time)

Can't get enough heat to open the thermo's, one side did open once, but not the other, but like I said, the pressure was off the guage at 3000 RPM's

200-2.4
2 piece exhaust plate
stock 200 heads (for now)
timing is set to about 23 degrees (for now)

Any ideas?

Welcome to my nightmare!

[Talon2.5]

possibly the wrong midplate gasket? the one that goes around the mounts between the plates?

did ya run a piss tube off the poppet cover?

[WATERWINGS]

do you know the number of the correct gasket to run between the two plates?

Same set up from below powerhead as last year.

And, no piss tube off of the poppet cover, still running the poppet valve now.

Went out again today, with 3/16 holes in quarters in place of thermo's.........still only 120 degrees, ran up to 4500, barely rose to the top of the 120* line.

If more water flow makes more heat, why am I still cold with nothing in the stat covers?

[VectorPat]

Are you running a light wieght cowling????

[WATERWINGS]

after market promax/style, two dump hoses.

[VectorPat]

My pressure has been higher since I put my pan and cowling on..All the holes on the gaskets match the ones in the plate the pan bolts to..My next plan is the hose off of the poppet valve..My temps on the old powerhead would not go over 115deg w/ 25+ psi @6500rpm..the new powerhead runs about 135deg w/ 30psi @7300rpm..Before the new cowling I had the 2peice XR2 cowling and had 20psi,I didnt have a temp gauge so not sure what it was then ..

[WATERWINGS]

My pressure is higher with the poppet in, without, it is like it should be, but still, I can't build any heat!

[PFord]

Did you put a new impeller in? I know a couple of guys that just put a new impeller in 225 ProMax's and they are having a similar problem. So far it has not caused any problems.

[WATERWINGS]

A new impeller makes them run to cold??:confused:

[O/B Dude]

It sounds to me like your poppet valve is sticking and keeping the pressure way up. When you take it out, the water flow thru the dump cavity increases and that keeps the temps down. I never considered the gasket issue...could be the problem. Hmmm
How do you feel about pulling the powerhead to solve the problem? DRY STACK IT! Then you can tune the water flow and thus the temp.:D

[Superdave]

There were 3 different styles, for some reason. You may have the wrong seat, or actual poppitt. I'm not sure of the exact differences, but some valves were longer and will not open very far. Raceman or Jay, US1 should know!
Dave

[Talon2.5]

the 678 in this scan should be the one for the 2 piece

i'm wondering about the cowl pan blocking off the triangular poppet dump area ofthe midplate, if the hole in tha pan isnt there it would hold pressure even when the poppet opened, as vectorpat was saying

lots of good thoughts here

is it a double poppet cover or single? if it's a double you can run a piss tube off the smaller part of the cover to relieve it when the poppet opens, man i'm having trouble explaining it this morning, need more coffee :eek:

[WATERWINGS]

It's a single cover poppet, and I'm pretty sure that the cowl pan has the triangle hole in it for poppet relief, when I remove the poppet, pressure drops down to 0 to 1 PSI at idle, and10 or so PSI @ 3000, still can't make any heat though.

Also, If I had the wrong mid gasket, wouldn't it still have high pressure without the poppet?

[Talon2.5]

yep sounds like you have the right gasket

i dont think they ever figured out the cold running thing did they? in STV Kieths thread?

do you have the digital thermometers to be sure the readings are right? sure is strange to have a "cant get it hot" motor :eek:

[WATERWINGS]

Yea, #'s are right, backed up with infrared on heads, and with both senders in water with two other thermometers in the water.

[BLIZZARD]

if the pressure is too high the poppet valve is not opening
try another one
put in the t-stats and look if the poppet opens the pressure
should drop when it opens

[WATERWINGS]

Just got a great suggestion from a racer from these parts..........

Put a hose clamp around the tube that feeds the gearcase, from the nosecone, (Bobs) this will restrict the amount of water going to the waterpump, and make the motor temp go up.

I had a problem with motor heat last year, when the grommet was missing out of the top of the waterpump, causing not enough water to get to the motor.......heat went up.

Also, I have the 2 pc base plate with the hose that used to come from the port side, (that joined the two dump hoses, and went out into one dump) anyway, I have this plugged up, I wonder if I unplugged it and used it to bleed some water out, if that would also let me have more heat?

[WATERWINGS]

How about this.......

I was suggested that my problem was not water related, but to rich of a fuel problem...

The carbs I am running were on a 2.4 with a seven petal intake that was cross drilled, on a ported, hogged exhaust chest with 150 PSI heads.

The motor I am running now is basicly stock (except for hogged exhaust chest)

I have made no changes to the carbs, (they were set up for the super flow motor)

If I am flooding the motor with fuel and double oil mix, wouldn't that make the motor cooler??

Also, I opened the plugged, (stock 2.4 fishing motor) hole on the port side of the mid plate, and added a dump hose, that made a small difference, and gave me slightly more heat.

[WATERWINGS]

This weekend I pulled the poppet out, and removed the thermo's and put quarters in with 3/16 holes in them..........got even cooler......15 or so psi @ 6000

120* or less, it gets the hottest with poppet and thremo's in, but that is usually after a run, and a short idle in gear, port thermo opens for a short time, then closes back, then guages read around 140*, but cool back to 125-130.

When running its about 125 or so.