atb

Well, it's been a long time in the making, but they arrived today.

A true testament as to how not to build a stroker. The products and time lines available now compared to when I started this project have changed considerably. I could literally have started this project 6 months ago given current product availability and delivery times, and be the same place I am now, which is about 3.5 years into this project.

But nonetheless, these were the last custom pieces I've needed to go forward. I've got to burrett and measure for accuracy, and if all checks out, one of these will be accompanying my block to U.S. Chrome for nikasiling and another will be accompanying my crank and rotating assembly to my machinest for balancing.

Sorry for the crappy telephone pics, but these literally just came off the UPS truck. I'll post cleaner pics later.

6.0-928S

Congrats Adam! Kinda like Christmas morning ain't it?
Hammer

BC

Pretty. How much do the pins weigh? Nice skirt coating, and crown coating as well!

atb

Hammer wrote:
Yeah, more like Xmas morning waking up to a dozen Playboy bunnies wearing chocolate nighties, each carrying a chilled bottle of grey goose in one hand a copy of the 928 Int'l catalogue in the other.

B.C. wrote:
I'll have to check. I think when Garrity ordered them he went with the light weight pins, but the spec isn't in the build sheet. The pistons average 473.5 grams. We'll see if I'm going to be in the same boat as Stan, we both have the same crank and rods.

BC

475 is not super light, but strength in certain areas trumps weight. Save it on the pin, and machine it from the piston boses, and get real light rods.

atb

Well its a little late for that now. If I can make the Oliver's work, I'll use them. This is a street motor with an A/T tranny. I'm not looking for hyper quick revving motor, I can give up a couple tenths in a quarter mile and not be too worried about it.

Stan.Shaw@Excell.Net

I am watching with interest
493.1 pistons and 150.7 pins
Bob weight is 1894.8g, with Carillo rods and JE pins I can get to @1819.3

Maybe we'll will learn my local machine shop is calculating wrong....?

SwayBar

Those pistons got the schwing! factor for sure; I love it!

BC

We discuss these things like its the end of the world. I did not mean it that way, and in the end, if Stan, for instance, needs to pay 1000 dollars for malory, then he will, even if they have to duck tape it to the counterweights. We are all such bench racers, I think we lose sight: It'll be awesome whatever you do.

I have a scat crank, and a new oil pump, bare 89 heads, and a super-great hamronic balancer from that group buy Hammer did. So I watch all this in great interest for when I get into that engine and find the rest of what I need (rods, pistons, block, etc)

Yoakim Larson

Hi ATB, is this engine a boosted motor? I noticed the pistons are Ross. They normally use 2618, this is good for boosted engines as it is very strong. It can rattle around a bit as the clearances need to be quite large. There is a site called Matweb, it can tell you the rate of expansion for this material versus what the block will expand at.

Or have a look at this site, your pistons will be refered to as forgings. Piston clearances Notice the different clearances for the aluminium block down in the motorcycle section, they use a reduced clearance given aluminum expands at a different rate to the cast iron that is in many Ameriacan engines.

I would be curios to know what your engine builder is recommending for you in respect of clearance, just thought you should be aware of this before you send your block away, as per the site I linked you to, it does say more wear if the clearances are wrong, as well as less compression because of the piston tilting.

Stan.Shaw@Excell.Net

Brendan,

The machine shop said they did not believe they could find enough places on the small counterweights to add all the mallory. If they tried and failed, you still have an out of balance rotating assembly and you still have to pay for the mallory. So, a big issue to me, is that it is not known that it can be done.... Balancing externally might be the only option unless other components work for me.

Mike Simard

Congratulations Adam! Having the pistons is like being nearly complete. At 3.5 years you're blazing a trail of timeliness among us

atb

Yoakim wrote:

No boost, N/A. Yup, loosey goosey tolerances. 3 thou, not quite the 8/tenthousandths tolerance of the stockers. Bores will be 103.8mm. There were slightly overhoned which prevented the use of the 104mm pistons and rings. The minimun thickness required for the nikasil prevented me from using 104mm pistons and rings without over-boring even more, and my cylinder towers are already too thin, so that wasn't an option. The maximum thickness I could plate with the nikasil wouldn't reduce the bore size enough to get me into a standard size ring. This is what was so difficult about the piston/ring selection for my engine. Ross could build a piston to any bore I wanted, but they didn't have a ring available. Total Seal was eventually able to put something together to match the odd ball bore size (which was determined by the bore dimensions I would have available after Nikasiling) that would work. They aren't too fancy, but the guy at total seal said they would run at 6.5K rpm all day.

Thanks Mike. Dropped in on my machinest today. Told him to round up all the Mallory metal he could get his hands on. He said he's ready.

BC

I remembered it as "not sure they could do it" and with your statement that they "did not believe they could" makes your point valid. I misunderstood. Not to steal ATB's thread juice here, but did you find that lighter pins and rods will not work?

atb

Might be better to keep the balancing issues on Stan's thread just to make sure those that are following it don't miss out on any information. I'm actually going to be posting more stuff there tonight regarding the weights of my components. Brought my digital scale home and will have time to weight stuff once I get the kids to bed.