Dished pistons

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Carl · #1 Post by **Carl** » Sun Jun 17, 2007 3:09 pm

Just stripping a spare engine this afternoon. Whipped the head off to reveal dished pistons ! Anyone seen these before ?

The head has a 16VT14 camshaft. I'm puzzled because it has a 'standard' cam sprocket and the crank and cam timing marks line up. I thought the cam timing was different with performance cams. There is a second timing mark on the crank pulley. Would this be where the spark plug is actually firing ?

knightrider150 · #2 Post by **knightrider150** » Sun Jun 17, 2007 3:54 pm

Might be tr7 pistons.....

like so?

TONYSPRINTER · #3 Post by **TONYSPRINTER** » Sun Jun 17, 2007 4:16 pm

they do look like tr7 to me

Carl · #4 Post by **Carl** » Sun Jun 17, 2007 5:06 pm

The dish shape on that piston is the same as mine but there are no cut outs for the valves. In fact there are marks on the raised flat area that must have been made by the inlet valves. Odd !

#5 Post by **Mad Mart** » Sun Jun 17, 2007 5:09 pm

After I'd set my STR91 cam up the standard markings lined up. Have the holes in the cam shaft sprocket been slotted out?

knightrider150 · #6 Post by **knightrider150** » Sun Jun 17, 2007 6:25 pm

Carl wrote:The dish shape on that piston is the same as mine but there are no cut outs for the valves. In fact there are marks on the raised flat area that must have been made by the inlet valves. Odd !

might be low compression Tr7 pistons .... for the yank market.

USASPRINTMAN · #7 Post by **USASPRINTMAN** » Mon Jun 18, 2007 3:50 pm

They look exactly like the awful pistons that robbed US TR7s of power. We had 89.9 horsepower in Federal spec TR7s, embarassing for a sports car!

Someone has nothced them for the valves, it looks like.

Richard Truett