Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
438's are 421's (almost exactly) but mildy modded to idle well using stock timing (and more importantly not stall at return to idle which is what 421's do on the stock inlet). 421's are awesome, always have been, but while they caused stalling it was a minor safety consideration. 438's are...
it'l be something not plugged in, something wet, or the throttle body playing up. When you clean the TB, did you lubricate it? If you didn't then the degreasing chemicals will dry out the bushes the spindle sits in and create friction, this will potentially stop it reacting how the ECU wants and...
any lowering springs will shorten the life of old shocks. That goes for any car really. I did a pair of rears last week, and a pair of fronts today on cars that have had just lowering springs for a few months.
you're absolutely right, it can be a bit marginal having the return in the sump. Not allowing oil to flow away from the bearing core can cause an issue with excess pressure, which can lead to oil breaching the seals. I've seen people fit return pipes that drop down from the turbo then loop back...
got one from Maplins for £25. Lasted a week and it's never worked since. Now I get them direct from Canems whenever I order an ECU and it's under £15. Works perfectly with every ECU I've tried it on so far (Canems, Omex, GEN90)
have never seen a 172 have head gasket failure unless it's been a full melt down. they just dont do it.
Most like suspects are
-Radiator
-Stat housing
-Water pump
My opinion, if you've never done it before, you'll be happy as larry with 4 over the whole weekend. I did 2 last year as a driver and a few as a passenger, and about 8 as a passenger only the year before, an I didn't feel at all short changed. I did go out for a couple of 9.02 BTG laps though...
they time up fine with the stock locking tools. The peak lift timing is changed with different lobe positions.
If you really want to fine tune them, then you will need to have something like the CATCAMS locking tools, which let you remove the rocker cover and use a DTI to time in the cams.
As...