inlet manifold

[phatwake360]

on the inlet manifold you have a coolant jacket built in, from a racing point of view would it be better to blank this off??? i.e colder denser air??? just playing around with a few ideas

opinions??:thumb:

[garyc]

In theory yes!

[Adam]

In reality, probably not worth the bother.

[mikey14sr]

In reality, probably not worth the bother.

True, considering the heat soak into the manifold from the head?

[mowgli]

on a carb engine, the manifold also has the temp sender (which is also the system bleed point), and any gains would be hard to measure, just sort out a cold air pipe for summer running.

[phatwake360]

think ill have ago at blanking it off n see what happens :thumb:

[garyc]

get it welded and make sure to do something with the thermostat, but dont remove it completely!

[mikey14sr]

get it welded and make sure to do something with the thermostat, but dont remove it completely!

Thermostat's on the other side of the head!

[phatwake360]

to late the thermostats already gone lol

wanna keep it as cool as poss!!:eek:

[Adam]

Hmm, the thermostat helps pressure the system!

[mowgli]

what sort of engine spec are you running??????

if it is just a road going spec, then don't muck about with too much, if cooling is such a problem, have you had the rad flushed recently? also a diesel thermostat will get things a bit cooler.

[phatwake360]

its a 1300 sr used for autograss so it does 5 laps of an oval circuit at max revs in 2nd gear:eek: lol then it gets a rest for 10 minutes then the missus goes out and does the same :cry:

thats why cooling/ the inlet manifold is sooo important

[mikey14sr]

its a 1300 sr used for autograss so it does 5 laps of an oval circuit at max revs in 2nd gear:eek: lol then it gets a rest for 10 minutes then the missus goes out and does the same :cry:

thats why cooling/ the inlet manifold is sooo important

Twin, dual-fan rads in the back with a meaty electric pump?

[phatwake360]

looking at putting the rad in the back but in the class i race your not allowed to fit an electric pump

[garyc]

If you use a decent rad you wont have that problem! You need to put something in place where the thermostat was though.

[_JH_]

Nova or Corsa Diesel rad. Best thing I have used, but I keep braking them lol

2 speed fan too.

[Ash]

Only other problem with blocking it off, is you will not get a true temp reading. As I found out and melted a piston :)

I'm running a brand new GSi rad with a 10" push fan, which seems more than enough. Cost about £80 too

[phatwake360]

dont run a tem gauge anyway :eek:

if i dont know about it i dont worry about it lol lol lol

[mowgli]

the heat soak from the head will probably need water cooling to help keep it down. I once read an article from CCC mag back in the eighties about Astra/Nova Challenge 1300 tuning, where they used a metal washer in the thermostat housing to keep it at a working temp. some heat wrap on the chimney will help a lot, the biggest rad from the scrappy will also help.
If you are fitting a rear rad, then keep the water in the manifold, but restrict it (plate washer?) so you can still use the temp sender as an air bleed.