2ltr radiator cap. what's the recommended pressure?

ok ive got a mk2, with 2ltr pinto, twin dellortos and a handful of other mods, nothing ridiculous.

NOW, what's on my mind is, she started running hot lately. ive only been driving the car for about 2 weeks, and on the recent weekend it overheated twice. i noticed it lacking power, and stalling when sitting at the lights etc, so when i pulled over, and shut the motor off the overflow hose was P*SSING out!!

had to wait 10-15 minutes to fill up the cap and make it to the next destination. twice!

now heres my trouble shooting, thermostat is operational, did this with the hand on the radiator hose test (hold for 2 minutes, when you feel it get hot all of a sudden the thermostat's just opened.. right?)

bottom hose was alot cooler, cool enough for me to question the radiators blockage amount, but this is a reco'd one i paid $180 for!

so again i dismiss that. but when i sit there with it idleing for ages, and given the occasional rev, all of a sudden the cap will open and the overflow will start gushing out.

cap screwed? or is there a deeper overheating problem?

why i question the cap is because its just a cheapy $10 item from the petrol station. is it under pressured or could it have died already?

thanks guys!!

Checked the raditor flow with a garden hose?

Twin carbs..could be running lean? Getting a lot of backfiring? Tried putting a std carby back on?

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Originally posted by Avon

Checked the raditor flow with a garden hose?

Twin carbs..could be running lean? Getting a lot of backfiring? Tried putting a std carby back on?

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well im hoping to solve the overheating, so i can drive again, and take it to the dyno place around the corner from my work.

i haven't touched the carbs and they motor has only just now started running hot.

and yeah i backflushed the radiator when i had the engine out (2 weeks ago) and it seemed fine as far as i could tell??

get an over flow bottle.

What you will find that the T/stat is getting lazy as yes it will be opening and flowing at low rpm and idle but once you're up and driving the rev's will be higher as well as the water pump flow will be higher and the flow literally pushes the t/stat closed allowing a build up of presure so when you stop it backs up and pumps itself out of the overflow
Get yourself a new t/stat and make sure you boil it first to make sure it opens correctly

Danny

I mucked about tested the radiator & water system --- fitted a gauge & a tiye Schroeder Valve pumped it to 13 PSI and found the pump vented out the hole under it --- bunged that and them took it a bit higher and waited till the presser droped
sad

have you had a comprssion test

VERY VERY relieved! removed thermostat, dropped it in a pot of boiling water.

things dead as a door knob.

is 82 degrees the recomended for 2ltr then or..?

ill pick up a replacement 2moro and try again!

always good when its somthing easy