Toyspeed.org.nz Message Board

by **DeeCee** » Thu Aug 30, 2007 5:27 pm

Does anyone know of a place in Wellington that does shot peening?

I found this place in Christchurch so far:
http://www.aviationenterprises.co.nz

by **no_8wire** » Thu Aug 30, 2007 5:38 pm

I got mine done .Flightline Aviation, out by Ardmore airport.
110 all up for a set of rods. (including sending them back to me!)

by **bluemaumau** » Thu Aug 30, 2007 5:45 pm

yea i got quoted 100 but that was me pick up and deliver

by **DeeCee** » Thu Aug 30, 2007 6:02 pm

and here i was thinking that it was way more expensive..
thank you - you've provided me with a very viable option dependant on my research and information gathering that i am currently undertaking

by **Mr Revhead** » Thu Aug 30, 2007 6:14 pm

theres a place in the hutt... but i dont know who it is

OMG so shiny! · by **Dell'Orto** » Thu Aug 30, 2007 6:54 pm

Colliers in Levin can do it, bout $25 per rod.

by **DeeCee** » Thu Aug 30, 2007 6:54 pm

cheers Warwick

i'll go for a stroll in the yellow pages soon

by **Mr Revhead** » Thu Aug 30, 2007 11:13 pm

ill find out who it is, they are good enough that the guy who tole me about them sends his bits down from hamilton

by **bluemaumau** » Mon Sep 03, 2007 12:22 am

so what are peoples thoughts on shotppening? worth it.?

what sort of % stronger is it going to make the rods?

my engine biulder isnt keen on my rods (silvertop/ae101 gze rods)

by **matt dunn** » Mon Sep 03, 2007 12:27 am

bluemaumau wrote:
my engine biulder isnt keen on my rods (silvertop/ae101 gze rods)

Why? They support over 350hp? What are you planning?

by **bluemaumau** » Mon Sep 03, 2007 12:28 am

yea i know that but he doesnt think theyre any good!

do you know what sort of % stronger it makes the rod?

by **d1 mule** » Mon Sep 03, 2007 7:21 am

as far as im aware shot peening dont make the rod any stronger it de-Stresses it thus giving you pretty much a new rod. which makes sense to me but i fail to see how heating something up and hitting it with hammer makes it stronger.

however i may be completely wrong

by **strx7** » Mon Sep 03, 2007 7:44 am

bluemaumau wrote:yea i know that but he doesnt think theyre any good!

do you know what sort of % stronger it makes the rod?

30-40% according to my local auto machinist

by **IH8TEC** » Mon Sep 03, 2007 8:15 am

bluemaumau wrote:yea i know that but he doesnt think theyre any good!

he obviosuly doesn't know toyotas that well then

by **DeeCee** » Mon Sep 03, 2007 10:04 am

shot peening reduces residual stresses, but doesn't make the whole rod stronger. It makes the external surface stronger and more resistance to cracks and resultant failures.

Shot peening is a viable option for me over forged rods simply because
a) i want the crankshaft peened, strengthen and balanced
b) the 3sgte rods are already good for 500hp+ so i can spend the money i save over forged rods elsewhere in the engine build

Fivebob wrote:Why bother with Gen III rods??? The Gen II ones are good enough for 500HP+.

viewtopic.php?t=54107&highlight=3sgte+rods

by **strx7** » Mon Sep 03, 2007 10:42 am

can anyone give me some info as to typical weight difference between a factory rod and a forged one. any engine, just as a comparision.

by **barryogen** » Mon Sep 03, 2007 11:01 am

strx7 wrote:
bluemaumau wrote:do you know what sort of % stronger it makes the rod?

30-40% according to my local auto machinist

thats quite a big increase... next time my engine is apart, me thinks I'll get that done.

by **DeeCee** » Mon Sep 03, 2007 11:17 am

Remember.. doesn't = overall strength.. just resistance to fatigue stress.

by this paper:
http://www-mime.eng.utoledo.edu/people/ ... and-OH.pdf

page 8 on improving fatigue stress and supporting graphical data on page 18

To improve fatigue performance of forged components, reducing surface defects and/or their effects play an important role. One way to achieve this goal is to induce surface compressive residual stresses. Applying localized inelastic deformation through processes such as shot peening or surface rolling, are the common available methods of inducing residual stresses. Fifty percent greater fatigue strength has been reported in rolled threads, compared with cut or ground threads made of high strength steel (1).

Figure 6 illustrates the beneficial effect of shot peening on fatigue resistance of gears. Thermal processes can also induce residual stresses. For example, in surface hardening of steel by processes such as induction hardening, carburizing, or nitriding, in addition to the hard surface produced, a beneficial compressive residual stress is also created on the surface. This compressive residual stress can very effectively prevent
the formation and growth of cracks.

oh and as a testament to the benefits of shot peening, AnthonyM had his 3sgte crank and rods shot peened and dyno'd at 450hp

by **Mr Revhead** » Mon Sep 03, 2007 11:51 am

Mmm, Boost wrote:Colliers in Levin can do it, bout $25 per rod.

turns out that was who the person i was talking about used.
said they did a really good job

by **DeeCee** » Mon Sep 03, 2007 11:56 am

cheers for the confirmation

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