FYI, turbo

[Anonymous]

True, but custom fabrication is also much more expensive. My headers so far are in upwards of a grand. A set of the same if not higher quality from Hooker for a small block chevy is under 500.

[mythos21]

thats true and it is a shame. I guess that it still seems relatively inexpensive compared to having the same amount of horse power come from a rotary motor. not only that but when I'm done this motor will far outlast my rotary. However an exception to that rule is I contacted Crower to see how much it would be fro a lightweight high power crankshaft would be and that quoted me $3,200 as well as a 165 week waiting time along with the original crank! Sometimes being different does have its drawbacks, not that I'm going to buy one, I'll just strengthen the stock crank.

[SappySE107]

165 week waiting time seems a bit excessive for a crank.

[Lyle's GTP]

How do you "strengthen" a stock cast crank? Does it have something to do with shot peening and a slightly larger radius on the rod and main journals?

Lyle

[Gemmer]

what? 165 week?! so like...it would take them over some 3 years?

[mythos21]

Yes over three years! talk about BS. While increasing journal size will help I believe with load dispersion(spreading) I meant to have the stock crank cryogenically treated to increase its overall strength and improve its grain structure similar to forging. this also stress relieves it as well. However why in Gods name would you shot peen it, that would leave tiny divets all over the journals that would eat your bearing. If I was to do something like that there is a process where they hit the part you wish to strengthen with a high power laser that does the same thing but also improves the surface texure of the part for less friction, you know smoother molecular plane

[mythos21]

I had my 2000 Kawasaki zrx 1100 engine, head and rods cryo treated and so far the process has saved me quite a bit of money. the motorcycle is now a 1300cc bike with close to 200+hp with all the mods on it. thats over twice the stock hp levels and the thing now redlines at over 16,000 rpm and I have yet to break anything however valve float is somewhat of an issue still as well as proper AFR tuning. when I do the crankshaft I will have the whole enigne treated since it saves you money doing then all at once. For the rods though I think I will get eagle or Pauter which will set me back about 1000-1200 bucks

[Lyle's GTP]

However why in Gods name would you shot peen it, that would leave tiny divets all over the journals that would eat your bearing.

Well obviously you would machine and polish the journals afterwards. But anyway how much would cryogenically treating a crank cost? Do you recommend this process for rods as well, because this is one thing that shot peening is always used for.

Lyle

[mythos21]

Here inthe northwest my father had the motor cryo tanked for less than 300 bucks. I think that around 350 is what Northwest cryo treatment(systems?) asks for the whole engine assembly and possibly trans as well. remember that there "tank" can hold more than just one part and actually it costs less per part to have more than one part done at a time. Also if you machine and then polish the journals you just basically lost the strength and toughness done to the area by shotpeening since the proccess only hardens thousandths of a inch. I think that if cryotreatment is not your thing then you should look into laser(plasma?) treatingsince it does the same thing but does not significantly alter the dimension of the part or the surface. to treat the crank, and I will tell you how much it cost me later, I think is around 90-120 but dont quote me. the process should be cheaper as time goes by.One of the leading companies in this field is 300 below inc. Their number is 217-423-3070 in Illinios. they say that part strength is increased 200 to 400% Everyone from racers to manufacturers to NASA uses this technology. Also this Cryo tempering strengthens the whole part- I mean all the way through, even if you machine it again and again unlike shotpeening

[mythos21]

http://www.300below.com/

Here's there website, it has many anwers to most poeples questions

[Cotton]

treat the crank, buy or build a crank "main cap girdle", find aftermarket high performance rods.
if something is going to break in a sound engine at high rpm, its the rods. they stretch as they have to change the piston's direction from up to down. when they stretch past their "tensile" point, the small hole gives, and...........big mess.
LITE weight pistons are key.
while we are in there, lets reduce compression, say to 8.1:1, have the heads "o-ringed", balance the reciprocating assy, gets some head studs from ARP, and all of the other usuall goodies.
add a charge air cooler, and crank up the boost to 20psi? of course, our octane requirement will now be about.....109

[Lyle's GTP]

So, what would you have cryo treated? Heads, block, valves, cams, crank, rods, pistons, etc. Are there certain metals that shouldn't be cryo treated? I know Hyperutectic pistions have a certain crystaline structure, that is engineered for preticular strengths and heat dissipation characteristics. Would this be effected?

Lyle

[brian89gp]

Don't know how they cryo treat, but don't use Hyperutectic pistons in a boosted app. They are stronger then cast yes, but when it comes to knock they are weaker then cast and your bound to run into some knock on a boosted motor at some time or another.

[Cotton]

have the crown of the pistons coated with a "thermal barrier", such as ceramic, also a good idea to coat the combustion chambers. Keep the heat in the cylinder, heat is energy. (also slows the heat's escape into the cooling sys), which is lost power, same theory will work for headers on a N/A car, insulate the tubes, keep the heat in, keeps the velocity up also keeps the eng compartment cooler.

[Lyle's GTP]

Hey, found a place here in Edmonton called Cryotron that does this. They will take your engine and tranny, tear it down, clean it and temper all suseptable parts for $425.00CDN The parts will include, Crank, Cams, Rods, Block, Gears and anything else that would benefit from the process. This guy claims a minimum of 30-40% increase of strength.

Lyle