Cams doubt

[oldeskewltoy]

Alex170984 Wrote:I'm in the process of stripping / rebuilding my 4AGE

I will be purchasing the 252/260 cat cams - the TED components website which off almost the same cam state around 15-20 bhp

I will however be thoroughly checking my valve clearance and installing new valve springs to ensure the new camshafts do not destroy my engine. I'll also be buying new vernier cams too.

Total Duration - 260° / 252° Duration @ 1mm lift - 230° / 222° Cam lift 9.00 / 8.50mm - Valve lift is less by the amount of the valve clearance recommended by the manufacturer.

Before you drop any cash... look into (research) a concept called "dynamic compression ratio" The above cams MAY be too big(duration) and actually lower your engines overall performance.

Cam with lifts exceeding 8.20 cam lift (8.00 mm valve lift) should get adequate springs, stockers are reaching their limit. I recommend the Toda springs because of their cost, and their capability (capable of lifts upto 10.25mm)

BE AWARE - cams approaching, and going over 9mm of lift have been known to toss (Tiddly Wink) the adjustment shims. Shim under, or shimless buckets MAY be a worthwhile investment

Cat Cams timing procedure is adequate, although using a piston stop to determine TDC is far easier, and just as accurate(if not more so) then their method with the dial indicator.

Project D Wrote:More importantly than just timing (you may lose a little bit of power, but you don't risk an engine failure), always check the valve clearance !

I have seen to many people "dropping" cams in their engine without checking the valve clearance...

VERY true... you also can lose more power by loose clearances.. why I always fit the shims to the minimum spec