Engine Building-What Products?

[blageo23]

That main girdle thing is interesting.
Right now I have a 20G turbo. Its just a FWD so I dont want to go too big. BUT I want the engine to handle "anything" I throw at it.

[Pushit2.0]

The main girdle piece looks nice, but I think they might want to torque the main studs to spec then see if they still have this problem.
" Torquing the main bolts to as much as 55ft-lbs didn’t help this at all."
The spec for ARP mains (10mm 190,000psi stud) is 60 lb/ft which is only 75% or the yield strength, they could try going a little more than 60 lb/ft to see if that helps. Also if they installed arps they should have line honed the block. If I have to make a piece like that I would integrate a windige tray into it.

~John

[santa]

The performance gains on a 3 vs 5 angle valve job are noticeable but usually not worth the additional port work required to make it worth while.

So let me get this straight. You're saying that the performance gain of a 5-angle valve job is not worth the extra time (sparing no expense at the machine shop)? The gains seen between a 3-angle and 5-angle valve job are typically 6-7cfm per port (from personal experience on a flow bench), and all you have to do is simply request this from your machine shop. How hard is that? If you are sparing no expense it is definately worth looking into.

[v8klla]

The main girdle piece looks nice, but I think they might want to torque the main studs to spec then see if they still have this problem.
" Torquing the main bolts to as much as 55ft-lbs didn’t help this at all."
The spec for ARP mains (10mm 190,000psi stud) is 60 lb/ft which is only 75% or the yield strength, they could try going a little more than 60 lb/ft to see if that helps. Also if they installed arps they should have line honed the block. If I have to make a piece like that I would integrate a windige tray into it.

~John

They were referring to stock main bolts at this point... Looks like a piece worth looking into though!

Chris

[Goat Blower]

The main girdle piece looks nice, but I think they might want to torque the main studs to spec then see if they still have this problem.
" Torquing the main bolts to as much as 55ft-lbs didn’t help this at all."
The spec for ARP mains (10mm 190,000psi stud) is 60 lb/ft which is only 75% or the yield strength, they could try going a little more than 60 lb/ft to see if that helps. Also if they installed arps they should have line honed the block. If I have to make a piece like that I would integrate a windige tray into it.

~John

You'd have to read more about it to know what it was designed for. It's not a band-aid for improper torque specs. It's one of those things that if you need it, you'd know.

[Pushit2.0]

The pics on the web page and the motor they talk about was using arp mains, so I thought that was the torque spec they used for the arps. Making a plate like that would not be hard, but $150 is a good price.

~John

[Super Bleeder!!]

just use stock cam gears. you can re-mark them yourself and spend the 40 bucks somewhere else!

[JET]

Yeah, there is no need to buy 2.4 cam gears.

[niterydr]

So let me get this straight. You're saying that the performance gain of a 5-angle valve job is not worth the extra time (sparing no expense at the machine shop)? The gains seen between a 3-angle and 5-angle valve job are typically 6-7cfm per port (from personal experience on a flow bench), and all you have to do is simply request this from your machine shop. How hard is that? If you are sparing no expense it is definately worth looking into.

You are seeing 6-7cfm per port on a dsm head by changing out to a 3-angle to a 5-angle valve job? Whom-ever is doing the 3 angle valve job sucks then. Just going by personal experience ;). I am assuming you did this in school, or did MAP buy a flow-bench? Maybe you can tell me at what pressures those gains were seen at? Cam height? Valve seat angles? Where were they seen? Peak? Low-lift? Midrange? Overall gains? What size valves were these on? What flow bench? What bore size? Please enlighten me in your experiences.

I have done plenty of research into valve seat angles compared to cfm gains in different ranges, you do realize that the cams we are working with are usually less than .450" lift? I also have done PLENTY of research into wear characteristics and longevity of a 3-angle valve job vs. a 5-angle on a STREET CAR.

Different part selection, changing valve heights, adjusting port configuration are all more things "worth it" on a spare no expense situation.

Finally, if you read the customers post, instead of a my posts, you would realize that he has already paid for a 3 angle valve job on his current head and was inquiring if it should be sufficient. I was simply stating the added costs of going to a 5-angle valve job won't notice him huge gains. Hince the recommendation of going with a 3-angle valve job.

So I will state again. The costs involved compared to the potential performance gains will lead me to state that Mike will be better off keeping his current head and putting the money elsewhere.

[1ViciousGSX]

The cam gears are off by 1/2 a tooth. How do plan to re-mark them? Either way you are 1/2 tooth advanced or 1/2 tooth retarded. Buy 2.4L gears or adjustable 2.0L gears and degree them in like I did.

From reading this thread, you might want to let somebody build it for you.