sheepdin

OK, I am still a newbie, but anyway, I want to ask....

I do a bit reserach on the FD. I find that overheat is the main problem to blow the rotary, right???

Coolant leakage is the main reason to make the aged rotary to overheat. So when I getting a FD, should I get a set of Samco silicon coolant hoses for back up??? And are these package enough for all the coolant hoses??

I do heard about boost problem becaz of cracking of Y-pipe. So a set of silicon back up will help???

Beside these 2 problems, which will make the rotary blow though??

THX THX~~
PLz help, I have done research.

Nathan Kwok

Keep using that search button, there's a lot more info you're looking for out there. Silicon coolant hoses won't prevent overheating, although they don't hurt. You are getting the internal coolant O-rings confused with regular radiator hoses. These tend to go out and cause coolant leaks INTO the combustion chamber, very bad. Now, there are silicone impregnated/teflon coated internal engine O-rings, but, this requires disassembling the engine, which you're probably not up to at this point. The split y-pipe coupler causes a boost leak which can lead to premature turbo failure, but this won't cause a blown engine. But, replacing it with a silicone coupler is again a good idea, and a very common "mod". The other killer is a blown apex seal, this is caused by detonation or wear. If it blows due to wear, be happy because it takes over 200,000 miles. Usually detonation is the culprit however, this is brought on by running too lean, running too much boost, or getting a bad tank of gas. So avoid those, don't overheat, and you're set.

sheepdin

thx nathan~~

So the OEM hose will crack and cause leakage of coolant?? And made the engine overheat right???

Nathan Kwok

The OEM coolant hoses are actually pretty good, silicone ones will probably be better but the OEM ones aren't known for cracking. The most troublesome OEM hose is the turbo coolant hose, its hard to get to but since its so hot down there it needs to replaced at a regular interval. Don't know if you can get a silicone replacement in the right size and shape. The most common cause of overheating is actually a stuck thermostat, that and the stock radiator is really too small for hard driving. The other common causes is a leaking AST, so get an aftermarket aluminum one that won't leak.

sheepdin

Thx a lot Nathan~~

Mahjik

iTrader: (1)

Actually, the radiator is quite capable of cooling, the problem is the plastic parts that tend to crack from excess heat.

Most of the problems that happen with the cooling system are due to plastic parts that crack and fail due to the extreme under hood temps (like the radiator and AST).

This is the reason most people usually switch out the stock radiator with it's plastic parts to an all aluminum radiator (same thing with the AST).

Hoses can/will fail. People have replaced some of the cooling hoses with a kit from Hose Techniques:

http://www.hosetechniques.com/

It's not necessary that you replace every hose just for the heck of it, but it's a good idea to at least keep an eye on all the hoses. Check for excess wear and make sure they aren't bent or kinked on other engine parts on a regular basis.

sheepdin

Mahjik~
Thx a lot man~~
I learn more about rotary again~