Масляный радиатор на XR250 Опции

[sey18]

В связи с глобальным потеплением озаботился я дополнительным охлаждением двигателя.Тем более планируется поездка летом в некоторые южные страны где много песка и верблюдов Маслорадиатор от Джебеля подошел по габаритам идеально,в дополнение к штатному маслобаку в раме полностью снимает проблему перегрева двигателя.

крепеж радиатора варить не стал,все съемное,как ,видно из фото

Родные шланги радиатора срастил с трубками от ХР,все достаточно надежно.Испытал прошлым летом,все работает,при 40 град жаре буксовал в песках и температура в голове не превышала 110 град.У меня там датчик от Вайпора стоит,на фото видно.(Это при работающем двигателе,масло циркулировало).
Зимой вскрыл голову,посмотрел-маслосъемные колпачки не задубели,т.е. температура была не критична.
А вот сейчас задумался,чтобы в холодную погоду (при морозах)соблюсти температурный режим решил отключать радиатор.Но чтобы все было мобильно,в течение нескольких секунд переключать режимы "зима-лето".Поставил кран в магистраль,но не стал усложнять систему переключением потоков масла,а просто перекрывал прямую магистраль в раму.

Летом прямая магистраль перекрыта и все масло идет через радиатор.
Зимой прямая магистраль открыта и масло идет по пути наименьшего сопротивления в раму и лишь малая часть через радиатор.(Радиатор чуть теплый)
И еще одна причина установки радиатора,планирую установить в свою раму мотор от 400-ки,а там родной маслорадиатор какой-то неуклюжий Этот гораздо эффективнее

[IVANYCH]

В продолжении темы про радиаторы процитирую интересные выводы по поводу проблем смазки двигателей RFVC HONDA на основе экспериментов автора:


"Hi ,
In 2010 i had a broken Piston Ring on my 84 XL 600 R and by the rebuild of the Engine i found some demage on the camshaft and the rockers so i dit a lot of research on the Oil Pump and the Oil circulation in the RFVC Engine .

Here comes what i found out .

The funktion on the Check Valve is in fact that the Oil will stay in the Frame and in the Oil Filter and the External Oil Pipe to the Head as long as it is not demage or stuck open .

Think about a straw if you hold it under Water and press it tide together in the middle befor you lift it out .
The Water will stay abouve and below the place you press together in the straw .

If Air enter the Oil Pump Rotor with the Check Valve the Pump has big Problems to press the Air out against the Check Valve . I build adapters for the Oil Pump that allow me to run the Pump outside the Engine with Oil Hoses connected at speeds from idle to 5000 rpm . The Oil Hoses contain Orifice Rings that simulate the real Oil flow in the Engine . I test the Oil flow in ml per min. on all the the Oil Lines in the Engine to make shure i get the Flowrate right .
I test the Pump from my XL ( at this time about 15000 km and well inside all Honda specs ) and a brand new XR Pump .

If air is in the Pump and it run at speed from idle to 3000 rpm it need up to 90 sec befor the Pumps press the Air out and Oil start to flow . The shortest time in all my tests was about 38 sec.
I test this countless times with 20W50 at temperatures from 25 - 90 degrees celsius

If the Pump is running and oil flows to the head the Pressure inside the Oil Pipe that lead to the head is with at 20 degress Celsius 20W50 close to 1 bar . But only between the upper and lower Bolt .
With rising temp. the pressure drop to 0,1 bar on this Point . Thats at idle speed of 1300 rpm .

Inside the Oil Chamber on the right side of the cam is no pressure . The rotating cam act as a centrifuge and pulls the Oil inside the Cam . The Oil chamber in the head is at max. 3/4 full at idle speed and reving the engine sucks the oil in the cam faster then the Oil Pump can deliver the Oil . So the Oil Level drop everytime you open the throttle first from 3/4 to about 1/4 full for about 1 sec. then the higher rpm on the pump deliver more oil and the Oil Level rise back to about 1/2 full at 3000 rpm . higher speeds lower the Oil level .

Thats in my opinion the Problem that RFVC Engines have with permanet high revs.
If the Pump deliver the Oil not fast enough the Cam sucks the Oil Chamber empty and the lubrication on Cam and rockers stops .

And the hole Oil circulation is very sensitive about any modification .
I add a oil Cooler mounted under the headlights . With Oil temperature below 80 degress in the Tank ( thats 135 degrees Celsius inside the Head ) i had no problems with the balance on the two Oil Pump rotors .
But if the Oil temp. rise higher the pressure that the pumps can deliver sinks and then the smallest restriction (The Oil Cooler i use ) in the Oil Line back in to the Frame Tank reduse the Oil flow .
The Oil Flow on the two Pump Rotors run out of balance , the Level in the Frame Tank drop and the Level in the Engine rise up . To high Level in the Engine and the Oil gets blown out on the Crank breather tupe .

That way the Frame Tank can run very quick dry , the Pump that supply Oil to the Head can suck Air . You get the picture .
By my tests i was able to lower the Frame tank level from full to near empty in less then 10 sec.

My Tip : use the Oil Cooler with the highest flow rate you can find and install hoses as big as you can .

And one thing you may forget . The Oil seal in the Clutch Cover on the end of the Crank . If that Seal leak the Oil supply from the Pump and split to the Crank and the Head will reduse the amount of Oil that arrive the Head and this Oil drain back in to the sump . No notification , Engine and Frame hold still the correct amount of Oil but the Flow to the Oil Chamber in the head is redused .

You know to what it lead .

I dit some modifications to control the Oil flow easyer .

I install a Pressure Switch in the Oil Line to the Head with a warning Light on the Dash , triggert at pressure below 0,1 bar , and a Thermocouple in the Head . The Clutch Cover get a Oil Sight Glas and in the Oil Chamber in the Head i install a optical Oil level sensor .
See Pics .

Sorry for my english but i am a German and i messure in mm , bar and degrees Celsius . "

Возможно, это будет полезно для общего понимания возникающих проблемм головок.