Combustion Contraption

Which also means the "boom" has an easier time pushing the piston back down the cylinder on the power stroke thus increasing mechanical effiency, no?

ShaunRR

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LsVtec92Hatch &raquo;</TD></TR><TR><TD CLASS="quote">Which also means the "boom" has an easier time pushing the piston back down the cylinder on the power stroke thus increasing mechanical effiency, no?</TD></TR></TABLE>

That would be difficult to quantify. There are other things to consider. One could argue that it has to push more because there is less inertia keeping the crank moving from the last power stroke.

Combustion Contraption

*DING*

Good thinking rochester. You didnt fall for the bait. This kid has got a brain on those shoulders!! (I dont know if he's younger than me, but im assuming he is.)

Now, any ideas on how you could prove/disprove the above theory?

ShaunRR

Actually, it appears we are the same age.

I suppose you could try to measure the difference in force, but the best way I can think of is with a test motor. A motor with a dry sump oiling system to minimize any gains from windage, and measure on an engine dyno so the environment is controllable, all possible variables are removed, and power is measured by force not acceleration.

DEVIOUS_EG*

looks good

edo

These are work in progress shots on the 86mm crank we're opening up the rod journal to accept the 0.938" BE width (F20C/H22 rod bearing). It's got about another .005" to go but you can already see the big difference comparing the stock BE width K-series rod (0.780").

-Ron

137

cool.

hi-Powered

daymm..i'm learning here...
rochest...when you say "windage losses" does this mean
rotational drag of the crarkshaft..

Quitripin

Combustion Contraption

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by numbnut &raquo;</TD></TR><TR><TD CLASS="quote">daymm..i'm learning here...
rochest...when you say "windage losses" does this mean
rotational drag of the crarkshaft.. </TD></TR></TABLE>

No, windage as in a cloud of oil adding parasitic drag the rotational mass of the engine.

edo

These pics show two distinct stages of the crank - hard welded and a rough-finished journal (post weld). There are many in-between steps that are critical for the proper way to rework a stroker crank (OEM forged core), but these make for very interesting pics.

This crank as shown, just came back from spending a few days getting stress relieved and shot peened. The counterweights have a very nice satin finish, but will look much nicer once it's heat-treated (again), nitrided and the tear-dropped journals (not depicted in the above pics - it's one of the last steps) get their final micro-polish.

-Ron

137

cool thanks for the updates.

rev limiter

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MaxBoost &raquo;</TD></TR><TR><TD CLASS="quote">Does Castillo's Crank Shaft Service have a website? </TD></TR></TABLE>

I'd like to know also. How much would it be to knife edge a gsr crank and have it retreated and rebalanced ??

edo

I don't think they have a website. But here's the best I can do:

http://yp.yahoo.com/py/ypMap.p...fbT:0

Give Joe or Rudy a call, and let them know who sent you.

-Ron

rev limiter

Thanks !!!

edo

As promised here are the final set of pics depicting the crank in its final form from Castillo's. Notice the perfectly radiused and micropolished journals, oil plugs and teardrop chamfers. There's multiple steps in prepping the crank to this level. Thanks to Joe and Rudy for an excellent job. Can't wait to get the motor built.

-Ron

Archidictus

Holy **** that's nice !

edo

here are some cool pics while grinding rod journals:









-Ron

Aquafina

iTrader: (3)

Nice job on the teardrops.

flyrod

Thanks for posting all these pics! Very cool stuff.

PirateMcFred

Thank you very much for posting pics of quality work! I hope your engine makes a sh!tload of power!

Pirate

drives2win

Major props to rudy and joe, from the Pro Street Import kids!!! Eugene Castro (PSI owner) is located right next door and we get to see lots of amazing cranks come out of there and into our own personal motors and ones that Eugene builds. Looks great and i hope everything goes well on your build. let us know how it goes!!

Drag_On

Can't decide if I like the crank, or the pictures better..

Nice work regardless

edo

Rudy says one guy wanted to make lamps out of them since they're so beautiful!

Thanks for the great feedback and support guys.. will report once we have the motor up and running!

-Ron

b19coupe

Look forward to reading about it-and seeing graphs