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Stroker question

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kombiute Casual Dubber

30 posts · joined Oct 2006 ·

#605449
Hello,

I've just received my alloy Empi Bubble top case ready for a stroker crank

details are as follows:

EMPI H.D SuperStroker Engine Case - 90.5/92mm Bore - Stroker Clearanced - Bubble Top and Full-Flow Oiling - 2 Shuffle Pins on center main - 10mm Inserts - Filled behind #3

I'm now in the market to purchase all the bits from crank, cam, pistons etc and wanted to go the 90.5 pistons & B's. I'm currently running 40 idf webbers, and am going a c45 cam and I have my eyo on a Scat or Empi counter weighted crank.

My question is, can I go with a standard set of rods? I have been told that I can, if my buider adjusts the deck height and uses shims, is this correct? If so, will I lose any performance? also, if their any need to go with Ratio Rockers? I again have been told they will add 15% performance, but are not neccessary.

I do allot of surf trips up and down the coast, so I want performance, together with reliability. I'm also throwing this into a 70 dual cap ute. Any guidance would be greatly appreciated.

Cheers

Bizarre Moderator The artist formerly known as blue74l

12,787 posts · joined Aug 2002 ·

#605466
can I go with a standard set of rods? - depends on what crank you are going to run.
69mm - no problems. Then why would you have bought a bubble case
82mm - no way.

I think 76 and under you can get away with standard rods.

A rough rule of thumb is a 2:1 rod ratio.
69 crank has a 5.4" rod (137mm) ie 2:1

I think 5.7" is the longest you can get.

Have a read of some of the combos here
http://www.geocities.com/enginecookbook/menu.htm

Or go to www.aircooled.net and have a look at what makes up some of their long blocks

any need to go with Ratio Rockers? -
Depends if the cam you want says you can. They need to be designed for it.
Can put extra wear on the valve train.
Need to set the geometry of the rockers. ie custom cut push rods. Extra work that results in HP
Futue te ipsum!!!

56astro Custom Title Time!

1,772 posts · joined Aug 2002 ·

#605546
82 stroke with std rods (5.394) is quite common for street engines.

82 stroke with an even shorter porsche (5.352") rod is also quite common for streeters.

std stroke with std rods gives a stroke ratio of almost 2:1 like Bizarre said. That is extremely long in the engine world - like many diesel engines. About 1.7:1 is as short as many builders recommend.

Go the the STF also, heaps of info there.
http://www.shoptalkforums.com/

VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa

Bizarre Moderator The artist formerly known as blue74l

12,787 posts · joined Aug 2002 ·

#605566
Kombiute

The reason good engine builders are "good" is because they have experience.

Go through the Cookbook and click on all the 2L+ motors and have a look at the rod length.

Also have a read here
http://www.aircooled.net/gnrlsite/resource/articles/t1hpeng.htm
and go down to "Connecting Rod Length"

Bloody confusing if you ask me

:beer
Futue te ipsum!!!

Bizarre Moderator The artist formerly known as blue74l

12,787 posts · joined Aug 2002 ·

#605594
He is in Sydney (east)
Futue te ipsum!!!

kombiute Casual Dubber

30 posts · joined Oct 2006 ·

#605602
Thank you for the information! It's greatly appreaciated, VW54 I'm in the eastern suburbs of Sydney, why can you help with the build ? have you got a shop?

I will have a read on the suggested threads.

Thanks again!

vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 ·

#605603
I suggest that you talk with someone at a Shop who knows how to build a decent engine otherwise your wasting alot of funds
I read it on FACEBOOK so it must be true


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