Author Topic: ESR 330pv water passages? (Read 11133 times)

rsss396 · « **Reply #30 on:** April 28, 2014, 11:25:38 AM »

I will go out on a limb and say fuel with alcohol in it will actually make the engine run cooler than pure gasoline, any bike on methanol runs very cool and many drag cars race with E85 and they all remark how cool their motors run.
Now I know pump gas can be all over the place and if you are jetted for pure gasoline and dump fuel with the typical 10% ethanol in it it will run leaner and hotter but if you jet for it then there should not be a problem running it.

trx250scar · « **Reply #31 on:** April 28, 2014, 11:37:11 AM »

I have tried a larger lrd pipe and silencer. I run a new pwr radiator with no fin damage. Installed a OEM impellor I took out of package. Retarted the 01 cr ignition. Used a pump dome with 93 ethonal free and with 112. I have changed jetting even to an extreme rich. My motor Sounds great. Plugs are colored nicely. Even done a dozen plug chops with different jets. I have two other 250r I have built and tuned and ran now for 3+ years. There is something major wrong with this cylinder. I cannot say for sure if the drilling water jackets would have helped or not. I may fix the cylinder just to know. I kinda feel like the port timing is incorrect. Although everyone tells me if it were wrong it wouldn't run. I am not a n engine builder so I do not know how to setup or check port timing. However I cannot help but to think that if it were off just a small amount it would give me a real advanced timing causing the heat.and no matter how much I retard the ignition it won't b enough. I let the bike warm on idle to 150 before I ride. This takes about 10 minutes. Then I ride off. 4-5 minutes and it's over 220 and the ride back will peg the gauge at 250 and it will boil over. So I get a tow back.

rablack21 · « **Reply #32 on:** April 28, 2014, 11:55:13 AM »

Dang. That's pretty rough Oscar.

rsss396 · « **Reply #33 on:** April 28, 2014, 12:02:09 PM »

00-01 cr250 ignitions do not have allot of advance so you should be fine, i really can not see the port timing being the issue but it is strange since you have all the right pieces.
have higher exhaust port timing is not the same as more ignition advance, the exhaust temps increase with higher exhaust port timing because the cylinder has less time to absorb the heat from the combustion event. which technically means less BTU's into the cooling and more going into the exhaust pipe.
The same with better cooling around the exhaust port, if it has a restriction with less cooling ability then that means less BTU's into the cooling and more into the piston and exhaust.
You tried a lrd pipe that was a larger ID and it did not solve your problem, but it may be 1 piece of many in a puzzle needed to solve this.
I do not think you need to warm the engine to 150, 100 is all that is needed, but obviously this is not your problem

C-Leigh Racing · « **Reply #34 on:** April 28, 2014, 04:08:26 PM »

What did a pressure test tell you, how did that turn out.

Well, we know for a fact now, that coolant can get down & under the exhaust port in the ESR castings to remove heat, but that area over top of the exhaust port, where you drilled those holes needs to be machined & some of that casting removed.

If you could take a Pro-x cylinder & then a new ESR casting & measured both casting over top of the exhaust port, down through the opening at the top, that Pro-x casting will measure deeper from the deck down than the ESR casting will, so the ESR is thicker cast in that area, so for sure the Pro-x will cool better than the ESR.

One thing I can say, about the differences between the Pro-x & the ESR castings, if you take a Pro-x cylinder & carve in some very high exhaust port timing for a drag cylinder, if your not careful, you could carve into the coolant jacket trying to get the timing high enough.
The ESR, even after the machining has been done over top of the exhaust port, to thin that area, theres still plenty of meat left to carve in that high exhaust timing your hunting.

When you got the cylinder back from ESR, the area over top of the exhaust had not been touched by ESR, no new machining done to it ?.
Neil

trx250scar · « **Reply #35 on:** April 28, 2014, 04:52:55 PM »

No ESR did Nothing with the water jackets. Eddie says they r fine. I drilled it out and went to deep. That's the biggest reason I sent other to him so He could do it.He has the tooling and knowledge but refuses to do it. I honestly think here won't cause that would b admitting a cast problem then in turn be bombed with a bunch of customers wanting there's "fixed"

etccb · « **Reply #36 on:** April 28, 2014, 05:27:48 PM »

Yours is a power valve cyl and the only down in there mods done are to non power valves. If you try to do the non power valve mod down inside the jacket you will cut into the p v real fast. All of the past questions about this area have always been about the solid area of the non pv with one casting being used for both and this has never been a topic on the p v before. I hope you can fix that area damaged and continue searching for the temp source.

trx250scar · « **Reply #37 on:** April 28, 2014, 05:50:02 PM »

Yea it would b nice to fix it but I doubt I will b able to Maybe someone can. Not sure who to look to and further more not sure I want to invest anymore into this piece of crap ESR cylinder.

etccb · « **Reply #38 on:** April 28, 2014, 06:06:06 PM »

What ever you do from here be carefull and don't get too over confident in a cyl only change fixing your problem.
Good luck.