Valve-Piston Clearance On T16 Engine

[wicked 103 3 Cars]

Does anyone know the valve vs piston clearance on a T16 engine @ TDC?

Or what the max lift is for the inlet cam @ TDC?

[B1ack_Mi16 67]

I don't know exactly, but the orginal pistons sits about 4-5mm down the bore @TDC, and the camshafts only have max lift of about 7mm.

So there are very good piston clearance afaik.

 

Any particular reason to why you ask?

[wicked 103 3 Cars]

To choose between PeterT stage I or stage II

Do the pistons have significant valve pockets?

[welshpug 1,661]

I'd imagine given they sit that far down the bore they may not have any

[wicked 103 3 Cars]

In my imagination everything is possible and I think you're right, but I like to be sure.

I can find lot's of pictures of pug pistons on the internet, OEM and forged, but not from T16's...

[cybernck 402 1 Cars]

T16 camshafts are mild, swapping for Mi16/S16 camshafts apparently makes the engine much more lively.

 

I don't know anyone who has a petert inlet cam in his T16 though.

[AlexN 7]

I have, it's an Mi16x4 inlet regrind that Peter did for me. However my project is taking so god damn long to complete I haven't had a chance to find out how well it works yet!!

[wicked 103 3 Cars]

It'll be a stage II

[B1ack_Mi16 67]

S16 vs. T16 pistons.

 

T16 ones are much shorter and flat top without cut-outs.

[wicked 103 3 Cars]

Tnx...

 

The picture tells the story very clear ;-)

[welshpug 1,661]

same length rods?

[B1ack_Mi16 67]

Yes, both 152mm. As said at TDC piston on T16 sits about 5mm down the bore.

[Razkin 0]

T16 piston small end is with a clip like the S16? To me the piston looks the same as the RGY 8V turbo, but those have a pressed small end.

[B1ack_Mi16 67]

Yes it has floating pins, 23mm ones, same as S16 basicly.

[peter 20]

i may have got this wrong but, if the top of the piston is that much lower the CR would be reduced hugely.

 

If an s16 is 10.4:1? and 4 or 5mm was machined from the top of the piston it would reduce CR to much bellow 8:1??

 

[B1ack_Mi16 67]

On the S16 the piston is already sitting approx 1mm down the bore @TDC.

That's why it's popular to put in 88mm cranks to get pistons to zero deck, and get some more compression.

[peter 20]

So the s16 8v turbo have an 86mm stroke but the s16 piston sits 1mm further down the bore?

 

Unless that photo is misleading? And the t16 piston isnt actually that much shorter?

[B1ack_Mi16 67]

The S16 one is approx 3mm taller than the T16 one.

 

Edited April 30, 2012 by B1ack_Mi16

[peter 20]

Well that makes much more sense, so from 10.4 down to 8:1 is 3mm assuming the head and gasket has the same volume

Edited May 1, 2012 by peter

[pugman211 0]

i think the first photo is misleading as the pin location is at a different height. in the second photo were u put the pistons at pin height, that shows the true height difference.