Rocker Cover removal with ACT Plenum

[Scoobysnax1963]

Hi guys,

I need to replace the rocker gaskets as they are leaking a lot. However, I have an ACT Carbonfibre Plenum fitted. Can anyone advise the easiest way to do it pse. I didn't want to start the job and cause more problems. Do I have to remove the whole Plenum or is there an easy way?

Thanx
Mark

[haircutmike]

I don't think the ACT item is any bigger then the standard one.

If you remove the intake elbow, you can replace the gaskets without removal of anything drastic, (put mine on last night!).

Not a bad idea to renew the bolts for a shiny set of S/S bolts while you are there.

[Scoobysnax1963]

Thanx Mike,

However, I can't get to the lower middle bolt on the plenum elbow.

Do you know where I can get the S/S bolts?

[spend]

Studs are better making it an awful lot easier to drop the gaskets & covers straight on. 1/4" UNC is the thread size, I just chop & grind studding to suit. Trick is to get flanged nuts and stick (glue/sealant..) a magnet inside a suitable socket so that you can spin them on/off super quick without dropping anything

[haircutmike]

If you go for the bolts, this is what I used.

Get yourself an imoerial allen key or grind down a metric one.

http://cgi.ebay.co.uk/ROVER-V8-STAINLESS-ROCKER-CO...

[haircutmike]

Scoobysnax1963 said:

Thanx Mike,

However, I can't get to the lower middle bolt on the plenum elbow.

Do you know where I can get the S/S bolts?

Pic of middle bolt?

[spend]

ACT enlarge the plenum (in plan) with an adapter plate and use completely different bolt patterns + 3D space than you have considered

[haircutmike]

Out of interest, do the ACT plenums give any advantage over the 72mm plenums?

[900T-R]

Single throttle plenum is hardly sold these days anymore in TVR applications, but you'd expect the wider and better developed shape to give better air distribution above the trumpets. Less weight up top, too - but in honesty the choice between aluminium plenum with enlarged throttle or single throttle carbon plenum with the same size throttle will mostly be determined by aesthetics, unless you're running the wide flared 45 mm trumpets for which the wider carbon plenum is mandatory.

The center of gravity in carbon plenum sales these days lies with the twin and triple throttle systems which IME give fairly substantial gains in throttle response/driveability.

[haircutmike]

900T-R said:

Single throttle plenum is hardly sold these days anymore in TVR applications, but you'd expect the wider and better developed shape to give better air distribution above the trumpets. Less weight up top, too - but in honesty the choice between aluminium plenum with enlarged throttle or single throttle carbon plenum with the same size throttle will mostly be determined by aesthetics, unless you're running the wide flared 45 mm trumpets for which the wider carbon plenum is mandatory.

The center of gravity in carbon plenum sales these days lies with the twin and triple throttle systems which IME give fairly substantial gains in throttle response/driveability.

Minor thread hijack!

I have driven a triple plenum 5.2 on track, what stands out is the increased torque that enables you to rocket out of the bends .