Tempo Piston Question

[Anonymous]

I have my head off to be worked and have measured the deck height at .030. I am considering the Tempo piston as it will enable me to get the compression up to the 9.1 range without having to disasseble the engine for decking. My plan is to pull the oil pan, push the pistons out the top and replace. I have read this should not be done without a engine balance but I have been told it will be ok as long as I put each rod and connector back where it came from. The engine was not balanced when it was rebuilt anyway. Also I need to know if the Tempo piston is taller and changes the deck height.

Thanks,
Don

PS. Looking at the plugs with the head off front to back, I noticed that the plugs start tan on #1 and get progressively darker to #6. In fact there is a pronouced difference between 1-3, and 4-6. I had thought that 1 and 6 would be different than 2-5, any comments?

 

[wsa111]

Don, flat top pistons are available from sealed power the specs match the dish pistons for the 200 engine. the # 's are 489p in standard .020,.030,.040 & .060 these pistons are for the 1984 tempo engine hsc. the wb site for ordering them is: http://www.pickproparts.com/PartsList.a ... oryID=5620 . according from sealed power the weight is 585 grams for the flat tops, the stock dished piston is 635 grams. so an engine balance is necessary. hope this helps a lot of folks looking for more compression. Before i would balance i would weigh the tempo pistons & the pistons you are removing. Then make the desision to balance or not to. Hope this helps william : :idea:

 

[Anonymous]

Don, flat top pistons are available from sealed power the specs match the dish pistons for the 200 engine. the # 's are 489p in standard .020,.030,.040 & .060 these pistons are for the 1984 tempo engine hsc. the wb site for ordering them is: http://www.pickproparts.com/PartsList.a ... oryID=5620 . according from sealed power the weight is 585 grams for the flat tops, the stock dished piston is 635 grams. so an engine balance is necessary. hope this helps a lot of folks looking for more compression. Before i would balance i would weigh the tempo pistons & the pistons you are removing. Then make the desision to balance or not to. Hope this helps william : :idea:

Thanks Will,

You helped me make the decision to get another block and start over.
There's no use throwing good money after bad.

Don

 

[Anonymous]

I assume that an oversize piston, .030 in my case, weighs more than the stock one. I get into a lot of trouble assuming, does anyone know?

 

[MustangSix]

Balancing is good to do. I recommend it. But food for thought, I have used Tempo pistons as a direct replacement without any rebalancing and they work fine with no vibration. As long as the pistons themselves are not significantly different from one another in terms of weight, i.e. all six are the same weight, then you should experience no imbalance.

Not the case in a V6 or V8, but this generally holds true for inline fours, 60 degree V12's, and horizontally opposed engines.