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Old 11-11-2012, 05:30 PM   #16 (permalink)
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use a 20 deg dome piston.
you can end up with 100-110 cc heads it doesn't matter.
cut the 20 deg radius into the head.
fit and check cc cylinder and head .
you will be somewhere between 14.0 17.5
if your porter can cut the 20 deg radius in the head ,then let him cut it.
Randy is getting the pistons/cylinders for you and doing your crank work already from what you posted earlier?
send the motor to him.
if your porter cant cut the 20 deg radius in the head then let randy cut them . he will be cutting your valve reliefs and cutting the piston to bring it into the desired compression anyway.
he is more than capable.

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Old 11-11-2012, 06:07 PM   #17 (permalink)
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That's kind of funny actually and no discredit Jim
I would like Randy to respond on this forum.
I would like him to tell the public what he told me on the phone when I called him with a similar situation.
Short answer was not no maybe or yes,
It was Hell no and he had strong reasons to back it up, not sales.
I would do it in a heartbeat if the dome could safely reduced so that total piston weight was in the 500g gross neighborhood, had safe street cross sectional areas, and it was full skirted. Another challenge.
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Old 11-11-2012, 07:24 PM   #18 (permalink)
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Quote:
Originally Posted by nw_guy4_fun View Post
That's kind of funny actually and no discredit Jim
I would like Randy to respond on this forum.
I would like him to tell the public what he told me on the phone when I called him with a similar situation.
Short answer was not no maybe or yes,
It was Hell no and he had strong reasons to back it up, not sales.
I would do it in a heartbeat if the dome could safely reduced so that total piston weight was in the 500g gross neighborhood, had safe street cross sectional areas, and it was full skirted. Another challenge.
well if he dosent/wont do it, I know someone that can.
two 117 ci motors owned by forum members right here making 150-170 hp one with baisley hurricane heads and one with WFO Larry 110 heads,both running this piston.
all you can do is give the advice. I really dont care to hear someone explain why something that has been done several times already ,cant be done.
11.3:1 with the 640,and whatever piston they want to use will be fine anyway. go for it.
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Old 11-11-2012, 08:08 PM   #19 (permalink)
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I am just the messenger man

11.3:1 with the 640,and whatever piston they want to use will be fine anyway. go for it. That would be in the 88cc range with flat tops. Reasonable.

Sure it can happen.
So you suggest Baisley and I suggest Baisley, we agree then, Larry certainly is right there too. I agree.
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Old 11-11-2012, 10:24 PM   #20 (permalink)
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I am just the messenger man

11.3:1 with the 640,and whatever piston they want to use will be fine anyway. go for it. That would be in the 88cc range with flat tops. Reasonable.

Sure it can happen.
So you suggest Baisley and I suggest Baisley, we agree then, Larry certainly is right there too. I agree.
I wasent suggesting Baisley or Larry for doing his machining. just mentioned the heads that were used, with the pistons.
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Old 11-12-2012, 06:26 AM   #21 (permalink)
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FXDRYDR is reading this now saying WTF is this? FXDRYDR is reading this now saying WTF is this?
Good, illuminating discourse.

I left such issues to Dan B. and Justin at TMM - and there were such issues. With a build of this nature, even a reasonably competent ham and egger can be over his head before knowing it.
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Old 11-12-2012, 06:43 AM   #22 (permalink)
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That's why I left it up to Randy@Hyperformance. I have built a handful of mouse motors/top end builds, but this a ground up, big power, build better left to a pro. I am completely confident with Randy and his piston choice. I'm betting at least 140hp...safe bet.
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Old 11-12-2012, 08:13 AM   #23 (permalink)
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My comments are in agreement with all I believe. This is a complex build and integration will make or break. Mother my hopes are you end up with a motor that is done, no screwing around after the fact. Best case is the pro helping is the same guy calling the shots on pistons and headwork. Just a little cleaner that way. In this case I know Randy and trust him very much. My opinion is just one in the sea of them but really 140? A crate motor with a head mill can do that. I would hope that when using higher end hardware, which is where you are at with Hurricane heads you would be looking for more.
Just my 2c
I am not vying for this work either.
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Old 11-12-2012, 10:12 AM   #24 (permalink)
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The reason I don't like that style of setup with the angle squish cut is exactly the same reason I don't like the old httc setups, it boils down to too much weight above the piston pin and can result in premature skirt damage, I am not saying it wont work but the longevity would certainly be better with a flat top and a cut chamber.
As for that valve protrusion thing to try to put it in less technical terms than Don, as the valves are sunk further into the head they move farther apart from each other(because of the angle) to begin with which adds to clearance when they are both at lift compared to if they were closer to start with.
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Old 11-12-2012, 12:51 PM   #25 (permalink)
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For what it's worth, I am running at 11.5, with flat tops, shaved heads and the 640's in my 124. It was set up by Paul Matyka.
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Old 11-12-2012, 01:21 PM   #26 (permalink)
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Don, well does 150 sound better? Anything over 140 is a bonus if set the bar too high I will be disappointed
Don, I always appreciate your input
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Old 11-12-2012, 09:41 PM   #27 (permalink)
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For what it's worth, I am running at 11.5, with flat tops, shaved heads and the 640's in my 124. It was set up by Paul Matyka.
What is it putting down?
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Old 11-13-2012, 11:20 AM   #28 (permalink)
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FXDRYDR is reading this now saying WTF is this? FXDRYDR is reading this now saying WTF is this?
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Quote:
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Don, well does 150 sound better? Anything over 140 is a bonus if set the bar too high I will be disappointed
Don, I always appreciate your input
With what you're putting in, I would hope so. Heads and set up are certainly there. IIRC, you'll run the LSR w/2" primaries and I'd say that's a HP-maker. Torque will be strong as well.

Said it before - this will be a runner.
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