Apparently I've no stat installed, and I've noticed my stat bypass hose goes to my header tank, which seems wrong if no stat is installed as that means hot water going stright back through the system bypassing the rad. I clamped that pipe but it made no noticeable difference. I assume as it's a small pipe it gets ignored, with the water going through the main rad pipe?
When I bought the car the prev owner mentioned I had "performance" pullies and that perhaps my water pump pulley was too large and it could do with shrinking to speed up the pump. Looking at it it is clearly bigger than the crank pulley.
![Image](http://i97.photobucket.com/albums/l235/dodgey99/Westfield/IMG_1305_zpsda42d2a9.jpg)
You can't really see the crank pulley but you can see how large the water pump pulley is.
I was thinking of trying a smaller one but can't for the life of me tell what I actually have and where to get different sizes? It has been suggested I have TVR Power pullies but I can't find the site, and a site that sound similar has none like mine (Poly v?). Any suggestions. I've read that normally you have about a 1:1 ratio on RV8's - water pulley to crank pulley ratio?
Backgound: the engine is reported to be 4.3l but I'm told that can't be true as only TVRs have 4.3l size. I have dyno prints for 250bhp & 250 torque peake at 6000rpm. Drives wondefully to 6k. Only hesitates if she gets to 110 in traffic. Have to get her to 105 or below to get everything right again.
Oh - also - my fan temp sensor is on the input side of my rad (top). (I assume the water pump sucks water from the rad bottom into the engine). I've read that it's better placed on the rad output as that's the temp you are interested in? Kind of academic though as my fan is on pretty much all the time and can't get the engine below 100ish at stand still.