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914World.com _ 914World Garage _ Big bore case machining.....

Posted by: crash914 Jul 30 2004, 10:22 AM

Ok, case is at the shop being bored out for 103mm Nickies....

The cylinder slides in very nice, but the hole is real close to cutting into the threads for the head studs...

my question, is this ok? I don't want to torque the studs too tight and put a bind on the cylinder...

any one got pictures for a 103mm machined case?

Thanks, herb

Posted by: Jake Raby Jul 30 2004, 10:35 AM

tell the machinist to center off the existing bore and cut 108.5mm in diameter. Its not too close at all at that bore. I have completely cut into studs before with no issues.

Posted by: crash914 Jul 30 2004, 10:46 AM

Thanks Jake, this is what we are doing....

I will post a picture this weekend when I pick up the case.

It just looks like if you cut into the threads, there is a large gap for an oil leak...

I know blue silicone will seal it up, but I don't really want to leak oil...

thanks, herb

Posted by: Jake Raby Jul 30 2004, 12:51 PM

with your cylinders you should be far away from the case studs.. ensure that you cutters are set up right, I think you may have an issue.. Look at my webpage under research and see the 3.0 build up, even my 105s are not into the studs

Posted by: crash914 Jul 30 2004, 01:23 PM

yes, I did take a picture of your 3.0 with me...

I am right at 108.5, (4.2716") mine actually measures (4.270)"

Let me get a couple of pictures as I am not into the threads, but very very close (at least to me).

I was thinking that your 105's have a thinner wall..

The bore was dialed in before cutting so we are centered, I thought about moving the center of the bore, but just left it where it is.

I have a very nice slip fit, with a little wiggle room.

based on your comments, I should be good to go!!!

I just need lifters

Thanks for the help,
herb

Posted by: Jake Raby Jul 30 2004, 01:56 PM

did he center off the studs, or the existing register?

Posted by: crash914 Jul 30 2004, 01:58 PM

centered off the existing bore...

With new cylinder in place, studs are perfect.

I should be in good shape.

thanks again...herb

Posted by: Jake Raby Jul 30 2004, 02:21 PM

sweet!

When you torque up the heads, call me I have a trick for ya!

Posted by: crash914 Jul 31 2004, 06:07 AM

Now for some out of focus porn......

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Posted by: crash914 Jul 31 2004, 06:11 AM

Wait! that wasn't it....

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Posted by: crash914 Jul 31 2004, 06:13 AM

Nickie's got head...

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Posted by: Mark Henry Jul 31 2004, 06:29 AM

Shhhhwing!!!!

Posted by: thesey914 Jul 31 2004, 11:12 AM

Shame all that will be hidden under the fan shroud. I know the flat6 is hidden too but with the fan it makes the engine bar sexy....

Posted by: crash914 Jul 31 2004, 05:41 PM

Now for the money shot....

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Posted by: seanery Jul 31 2004, 05:43 PM

Herb, who's pistons?
What's the expected CR?

It looks BE U Tiful!

Posted by: crash914 Jul 31 2004, 05:52 PM

I have about 0.020" positive piston height...looks like 0.060" shims for me.....

Jake, have any other suggestions?

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Posted by: crash914 Jul 31 2004, 05:58 PM

These are 103mm Nickies, J&E forged pistons, 22mm pin 80mm crank with chevy journal....Scat rods, Jake cam....

For compression ratio, I am shooting for above 10:1....I am not sure about the final one yet...depends on pump gas and how much I want to blend my own gas...I only drive this about 1000 miles per year...not at all this year.

The motor is now ready for re-assembly....I will need to order cylinder shims, but that should be a quick turn around....

Wait till you see it all assembled with the fuel injection throttle bodies.....got wood just thinking about it.....

Posted by: Mark Henry Jul 31 2004, 09:17 PM

I think I better go change my underwear.

Posted by: crash914 Aug 2 2004, 07:44 AM

Just thinking about compression ratios....10:1 or 11:1

Posted by: Jake Raby Aug 2 2004, 09:53 AM

Herb,
That cam works best at 9.5:1... Believe it or not it makes MORE power at 9.5, than at 10:1 or higher....

Posted by: crash914 Aug 2 2004, 10:39 AM

Jake, thanks for the reply....I was hoping that you would respond....9.5 it is....

herb