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Finally! Building the stroker (pics)

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Old 09-01-2005 | 05:29 PM
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what heads/intake are you planing to use???
Old 09-01-2005 | 06:36 PM
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Originally Posted by 928SS
what heads/intake are you planing to use???
I have 87 heads, phosphor-bronze guides, ported w/968 intakes.
G-Force valve springs, titanium retainers.
At the moment I'll probably use the stock intake if the motor is ready quickly. If time permits I planned on fabricating my own intake & integrating a rear facing fresh air shaker scoop drawing from the base of the windshield.
Thanks, Hammer
Old 09-01-2005 | 06:47 PM
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Originally Posted by Sterling
so you are going to use a stock 87 intake?
It is port matched to the heads, in case I have to use it. But hopefully I'll have the time to fab up my own as I said. I have two projects going at the same time, the stroker & the Race Hemi but only enough room in the garage for one at a time so if the Belvedere is out of the garage ( I'll be painting it soon ) for a long enough period I'll move the 928 in & drive my truck. I'll have considerable fitting on the 928 hood & cowl box to install the shaker mods.
Hammer
Old 09-01-2005 | 08:53 PM
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wow! nice!!
Old 09-11-2005 | 07:15 PM
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Just got back from vacation & went back to work on the build up. More pics:

1.You can see where I flycut the valve reliefs deeper so I can play with different cams without danger of interference.
2.You can see where I had to remove material from the piston skirts where the crank counterweights were making contact.
3.Mounted on the Carrillo rod before install. It may be hard to see but I'm using Total Seal 'gapless' rings - notice the 2nd ring rail bridging the gap to provide the 'gapless' aspect.
No sense in boring anybody with pics of me slipping the pistons in. I'll be doing more in the next few days. Man I live for this!
Hammer
Wow I didn't realize how far I had to shrink the pics to fit them in. Sorry, I guess it's all kinda hard to see.
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Last edited by 6.0-928S; 09-12-2005 at 10:43 AM.
Old 09-11-2005 | 09:03 PM
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What pistons are you using?
Old 09-11-2005 | 09:08 PM
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Originally Posted by BrendanC
What pistons are you using?
Porsche factory oversize Mahle.
Thanks, Hammer
Old 09-11-2005 | 11:07 PM
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Nice.
Old 09-12-2005 | 10:44 AM
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Ok, I figured out how to enlarge the piston pics & updated them above!
Thanks, Hammer
Old 09-12-2005 | 11:11 AM
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Hammer,
Are those carrillo connecting rods stock length?
Thanks
Carl
Old 09-12-2005 | 11:29 AM
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Originally Posted by cpires
Hammer,
Are those carrillo connecting rods stock length?
Thanks
Carl
Carl,
No, they're shorter.
Thanks, Hammer
Old 09-13-2005 | 01:33 AM
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Hammer,
With a stroker crank, the stock connecting rods will turn a bigger angle on the small end and by shortening the rod won't this worsen the problem? By lengthening the rod the angle is less and there is less contact with the piston and the small end bearing rotates less.
Thanks
Carl
Old 09-13-2005 | 12:09 PM
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Originally Posted by cpires
Hammer,
With a stroker crank, the stock connecting rods will turn a bigger angle on the small end and by shortening the rod won't this worsen the problem? By lengthening the rod the angle is less and there is less contact with the piston and the small end bearing rotates less.
Thanks
Carl
With a stroker crank if you don't shorten SOMETHING the piston comes out of the bore! Since I used factory pistons then you must shorten the rod. The rod/stroke ratio is around 1.6 to 1. Still very acceptable. Optimum is around 1.75 to 1. Besides, I'm not running LeMans! While I'm trying to build an efficient motor I'm not going to split hairs that much.
I don't know what you mean by "less contact with the piston". The rod never "contacts" the piston except where they are joined by the pin.
Hammer
Old 09-13-2005 | 10:05 PM
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Hi Marc,
Although your comment was in someone else's thread I did see it. Here's a pic of the 968 valves sitting in the eyebrows I machined. You must have really good eyes to tell if the machine work was off!
Hammer
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Old 09-14-2005 | 07:32 PM
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I have machined way too many pistons and the pocket lip appeared too "thick" for a 100mm piston with 39mm valves.

Looks good .. and looks like a 85/86 block!

Marc


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