Mi16 Kent Cams Question

[IanH 1 1 Cars]

Hello chaps. Firstly, this is my first post here, so hello!

 

Ive got a question about fitting cams to my mi16, which is out of the car at the mo, as Im in the middle of a shell swap and general rebuild of my beloved 205 gti, and have decided to play with the engine while it was out.

 

I have already bought and will be fitting a pair of kent PT1602 cams. Not the wildest, but more lift than the standards. Ive got the pistons out, and am polishing the crowns up while the head is off being gas-flowed, and was wondering if the piston valve recesses need to be made deeper or not? Im at the perfect stage to get them done if needed, and have searched this forum and others for some info, but there is scant little about. The head and bottom end are standard, and apart from a slight skim (about 14 thou) there should be no noticable difference. The valves are standard size, and the maximum lift for these cams is stated as 10.9474 mm from the Kent website.

 

Cheers for any info, and happy new year!

[Cameron 16]

I think the standard cut-outs are fine until you start going over 300 degrees duration, I'd wait for someone to confirm though.

[IanH 1 1 Cars]

Cheers for the info. Ive lifted these stats for this profile straight from Kent Cam's website:

 

Application - Sports ' R '

Power Band - 2000-6500

Cam Lift(mm) - 10.94

Valve Lift(mm) - 10.94

Duration - 264 deg

Timing - 22/62 62/22

Full Lift - I 110 Deg E 110 Deg

VC (mm) - 0.00

LTDC - I 1.65mm E1.40mm

Required Parts - CF55

 

 

As you can see, the duration is not 300, so Im guessing they should be OK, which is nice because I spent the better part of a day getting the piston crowns down to a mirror finish, and really dont want to go machining lumps out of them

[Cameron 16]

Well that assumption was only made based on Catcams not requiring any further mods under 300 degrees, but it obviously depends on the cam profile. Anywho, with a fairly low duration cam I can't see you having any problems.

[petert 588]

It's not the duration that matters, but rather the lift @ TDC. In your case you have 1.65mm on the inlet. You can run up to 2.5mm on a standard engine, which equates to approx. 2mm of piston to valve clearance.