Probe pistons

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Re: Probe pistons

Post  Lem Evans on August 9th 2018, 8:50 pm

Mark O'Neal wrote:
Lem Evans wrote:
Mark O'Neal wrote:Thanks. I'd appreciate it.

That OEM/AFR valve relief came out a lot better than I thought it would.

How many CCs in the intake relief of the 'dual' piston?

How deep?

.310 with w .375 top land. I haven't done it on a flat top yet, he had a dish. I'll have it in about two weeks. I think it will end up at 4 ccs.

Yes, I was thinking about the flat top unit. Dish be an easy deal.

While you are at it.....SCJ/P51/AFR dish.

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Re: Probe pistons

Post  Mark O'Neal on August 9th 2018, 9:19 pm

I can do it, just adding the SCJ to the dual pocket.

But it be ugly

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Re: Probe pistons

Post  Lem Evans on August 9th 2018, 9:35 pm

Mark O'Neal wrote:I can do it, just adding the SCJ to the dual pocket.

But it be ugly

It's easy deal with a dish.

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Re: Probe pistons

Post  gt350hr on August 10th 2018, 12:10 pm

-7 @ .310 by "my guess".

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Re: Probe pistons

Post  Lem Evans on August 10th 2018, 12:33 pm

Diamonds are .195" deep and will handle a big ass cam.

SCJ/P51 relief on a dish piston should be much more than a 'nick' in the rim.

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Re: Probe pistons

Post  rmcomprandy on August 10th 2018, 10:28 pm

gt350hr wrote:  -7 @ .310 by "my guess".

It needs to be deep for the stock production location notch but, much shallower for the others.
Doing it all with one notch would take a few cc's of metal for sure.

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Re: Probe pistons

Post  Mark O'Neal on August 11th 2018, 12:18 am

I'd do a single cut for the OEM and AFR and a separate divot for the SCL.

What compression height and compression ratio.....1.350 (with 4.300 or 4.500)?

The volume of the relief would be irrelevant then, it's just part of the dish.

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Re: Probe pistons

Post  Lem Evans on August 11th 2018, 10:43 am

Mark O'Neal wrote:I'd do a single cut for the OEM and AFR and a separate divot for the SCL.

What compression height and compression ratio.....1.350 (with 4.300 or 4.500)?

The volume of the relief would be irrelevant then, it's just part of the dish.

A divot. Exactly.

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Re: Probe pistons

Post  Lem Evans on August 13th 2018, 7:10 pm

Mark O'Neal wrote:I'd do a single cut for the OEM and AFR and a separate divot for the SCL.

What compression height and compression ratio.....1.350 (with 4.300 or 4.500)?

The volume of the relief would be irrelevant then, it's just part of the dish.

My curiosity about intake relief volume was relative to a flat top piston.

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Re: Probe pistons

Post  Mark O'Neal Yesterday at 2:12 am

6 or 7 ccs, would be my guess.

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