After reading 2point6's post with his new cam dyno im really doubting my cam choice. i have a set of Pro 2's waiting for me at DFE but, now i cant help but wonder is my build gonna be enough for them. I'm not doing anything to crazy Type S pistons and flat faced valves, mild port on the head, euro R intake 69mm tb, and a hytech header. Anyone think i should see if Don will let me try the pro 1s instead ?
thanks Joe

 

You will need high compression to make the most use of those cams. Ask DonF what he recommends as far as compression. There are ways to bump up compression such as milling the head and flat faced valves (neither of which I personally care for).

 

just talk to Don. He wont steer you in the wrong direction. I'd be going with the pro1's if you were only going to be using type S. Pro2's are pretty damn aggressive.

 

I talked to don,he sold me the pro 2's and gears. he's also the one building my engine. where can i get exact specs of skunks cams

 

My Lude's going in next month for a similar build.

Type-S Pistons & rods
Skunk2 Stage 2 Pro's + Valvetrain + Camgears
Skunk2 High Compression valves
Head word + port match IM
etc, etc

I'll also have a light skim off the block to bump compression, but my experienced engine builder highly reccomended the stage 2 Pro's over the stage 1's with this setup
IMO you will be fine.

 

I would run 12.5:1 compression with those cams. We have a set of these cams going on a 90x95 build. I was hoping to put out results before 2.6 did... but it sounds like he will get to it before we do.

I can't wait to see how much power they make with the 52mm itb's

 

i just got off the phone with don he told me i will be fine and even went into explaining how if the engine makes more then 100% VE the static and dynaminc compression goes up. i'm pretty much stuck with the pistons unless i sleeve and thats a little out of my budget right now. thanks Joe

 

You slightly misunderstood him, what he told you was that given a static compression ratio, and a VE over 100% due to good induction/head/exhaust work, that your dynamic compression goes up.

Dynamic is what matters, either way I agree with don, your CR will be enough, and they'll make good power.

 

maybe change your crank and rods for a greater stroke(f22/h23)
also go up in compression by one point

 

The stage 2 pro's will work... but I was simply saying the higher the compression the better your results without getting into explicit detail.

Here is some good info.

http://physicsforums.com/showthread.php?p=1217970

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bb4ever &raquo;</TD></TR><TR><TD CLASS="quote"> what he told you was that given a static compression ratio, and a VE over 100% due to good induction/head/exhaust work, that your dynamic compression goes up.</TD></TR></TABLE>

thats exactly what i meant havent had physcics in 4 years im a little rusty.

 

I am in th e process of building another engine that will be around 12.5/1 Comp.
It will be using the Pro 2 cams, but everything in the engine is going to be different from the last engine I built. All of the internals are considerably lighter than before as well as an increase of bore from 89 to 90mm. Also, My TWMs will be opened to 52mm from 50mm and my injector sizing will go from 440cc to 550cc+.

I am waiting for my Carrillo rods to get in, then the engine should be assembled fairly fast and back on the dyno. I will keep you all informed if it works or not.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point6 &raquo;</TD></TR><TR><TD CLASS="quote">I am in th e process of building another engine that will be around 12.5/1 Comp.
It will be using the Pro 2 cams, but everything in the engine is going to be different from the last engine I built. All of the internals are considerably lighter than before as well as an increase of bore from 89 to 90mm. Also, My TWMs will be opened to 52mm from 50mm and my injector sizing will go from 440cc to 550cc+.

I am waiting for my Carrillo rods to get in, then the engine should be assembled fairly fast and back on the dyno. I will keep you all informed if it works or not. </TD></TR></TABLE>

Are you gonna use the 98mm crank?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote"> We have a set of these cams going on a 90x95 build. </TD></TR></TABLE>
90mm bore? Is it safe to go that big?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bb4ever &raquo;</TD></TR><TR><TD CLASS="quote">

Are you gonna use the 98mm crank?</TD></TR></TABLE>

Yes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point6 &raquo;</TD></TR><TR><TD CLASS="quote">

Yes. </TD></TR></TABLE>

very good sir

 

This outa be some good stuff.... for H power

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by precisionelite &raquo;</TD></TR><TR><TD CLASS="quote">
90mm bore? Is it safe to go that big?</TD></TR></TABLE>

Darton MID's

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote">

Darton MID's </TD></TR></TABLE>

Do you see any issues running a 90mm bore?

 

Would I run a 90mm bore if I did?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote">Would I run a 90mm bore if I did?</TD></TR></TABLE>

Is it strictly a race car or a daily driver?

Sorry to be a little slow on the uptake here...I just thought that 90mm was too thin of a wall and would not last long?

 

I dont usually recommend 90mm bore on MOST peoples setups. Just because for longevity and reliability, meaning most people dont and cant check the condition of the motor or take it apart if something goes wrong. So I usually stick with 89mm in most cases.

90mm will work and it has for alot of people. but I'd only be comfortable with that bore size with someone that knows their stuff and can work on their own cars.

 

thats good stuff im taking my engine to DFE sometime after the 7th i will keep everyone posted. should be interesting going from my 95 S with 130 hp and a slushbox to a built h22 with an m2b4

 

The Skunk 2 Pro 2 cams will make power at a higher rpm, correct? Around the 8k range? If so do you have to have your crank balanced to that rpm range?

 

balanced is balanced, whether its at 1k or 10k rpm, if done right, it will be ready to rev to 8k just fine

**** I'm spinning my oem h22 bottom end to 8.5k as is