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New 4.2L mini-stroker recipes

Newbies, and basic Stroker Recipes... Get started with your first stroker here!!
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Cheromaniac
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Re: New 4.2L mini-stroker recipes

Post by Cheromaniac » June 3rd, 2019, 1:35 am

Russ Pottenger wrote:
June 2nd, 2019, 1:26 pm
I believe that is what Josh is running and it’ll up his static compression ratio calculations more in line what he’s looking for
Yup. I make it 9.50:1.

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jpradcliffe
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Re: New 4.2L mini-stroker recipes

Post by jpradcliffe » June 3rd, 2019, 8:32 pm

Not Silvolite. 677AP +.030. 15cc dish. Hadn't know those had a larger dish when I ordered them. Oh well. I'm thinking that the low 9 compression is ok considering could always play with a small amount of boost, provided I don't float a valve lol.

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jpradcliffe
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Re: New 4.2L mini-stroker recipes

Post by jpradcliffe » June 11th, 2019, 10:09 pm

:deadhorse:

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Cheromaniac
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Re: New 4.2L mini-stroker recipes

Post by Cheromaniac » June 12th, 2019, 1:08 am

jpradcliffe wrote:
June 3rd, 2019, 8:32 pm
Not Silvolite. 677AP +.030. 15cc dish. Hadn't know those had a larger dish when I ordered them. Oh well. I'm thinking that the low 9 compression is ok considering could always play with a small amount of boost, provided I don't float a valve lol.
It'll be fine.

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jpradcliffe
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Re: New 4.2L mini-stroker recipes

Post by jpradcliffe » September 15th, 2019, 4:44 pm

Ok so. Big thanks to Russ for the roller rockers!

Now: Lifters, gasket, head, pushrods & rockers installed.

Oil pump primed.

I go to hand crank the motor to check rockers and pushrod lengths andddddd....... Da dah. Motor will not make a full turn.

I Drain the oil. Pull the pan. And....Guess what?

Ye ol' machine shop had "neglected" to shim/washer the main girdle.

Rods would have hit the girdle and the Motor would have been destroyed on first crank.

I am sure there is wisdom on this subject and would greatly appreciate any advice.

This video https://youtu.be/wH3MkRHSyw0 says to add washers on rod stud and under main....I am not sure that is wise. Please advise.

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jpradcliffe
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Re: New 4.2L mini-stroker recipes

Post by jpradcliffe » September 15th, 2019, 4:46 pm

Ok so. Big thanks to Russ for the roller rockers!

Now: Lifters, gasket, head, pushrods & rockers installed.

Oil pump primed.

I go to hand crank the motor to check rockers and pushrod lengths andddddd....... Da dah. Motor will not make a full turn.

I Drain the oil. Pull the pan. And....Guess what?

Ye ol' machine shop had "neglected" to shim/washer the main girdle.

Rods would have hit the girdle and the Motor would have been destroyed on first crank.

I am sure there is wisdom on this subject and I would greatly appreciate any advice.

This video https://youtu.be/wH3MkRHSyw0 says to add washers on rod stud and under main....I am not sure that is wise. Please advise.

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Cheromaniac
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Re: New 4.2L mini-stroker recipes

Post by Cheromaniac » September 16th, 2019, 3:43 am

Here's your answer:

Image
The rod caps wouldn't clear the main bearing stud girdle, so two 5/16" hardened steel washers had to be inserted on each stud to raise the girdle and provide the necessary clearance.

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jpradcliffe
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Re: New 4.2L mini-stroker recipes

Post by jpradcliffe » September 17th, 2019, 8:45 pm

Ah. Why thank you.

So I just decided to clearance the girdle at the contact point. Fits and rotates perfectly and the pan fits without the need for further modification.

So that's good.

Anywho. I have another query.

So being that my
Dynamic compression is 8.54 and my
Static compression is 9.15,

Were I to run a small turbo and intercooler setup at say 6 to 8 #'s of boost, what injector would I need? (I've read that folks are running 36#) but at what psi?

I'm currently at 39# ....provided I size the injectors properly, can I get away with running this setup with just a boost referencing fuel pressure regulator and check valve on map until I can understand/afford a mega squirt?

Please advise and thanks in advance.

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