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Old 02-21-2012, 11:57 PM   #26
jamal
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on a semi-closed deck with stock liners? That doesn't seem like a worthwhile endeavor.

there's a guy in norway with wills rings:
http://forums.nasioc.com/forums/show...&postcount=267
http://forums.nasioc.com/forums/show....php?t=1700067
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Old 02-22-2012, 12:05 AM   #27
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I have the 9/16'' Amr big boy studs bnib here wondering to sell them if someone needs them, I'm subscribed to watch the build.
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Old 02-22-2012, 09:13 AM   #28
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Quote:
Originally Posted by jamal View Post
also, wrc cars use larger studs on the center two holes. It's something I've thought about doing. Interesting!

Although we were up to 38psi on cosworth 11mm L19 studs.

I think keeping the headgasket together is more an issue of temperature management than it is headstud size.
^^^^^^ this.
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Old 02-22-2012, 02:56 PM   #29
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Quote:
Originally Posted by wrx_driver_2002 View Post
I am running the A1 Technologies Bolts. 620 whp at 28 psi on a GT4094R with E85 and a mustang dyno. I plan on pushing the boost to around 35 psi in two weeks.
The MA performance bolts, I have heard good things about them. Which variant?

Quote:
Originally Posted by jamal View Post
on a semi-closed deck with stock liners? That doesn't seem like a worthwhile endeavor.

there's a guy in norway with wills rings:
That's Bjornar. I know his engine came apart though he I don't recall why. He ended up going back to a 2.0L with parts that he had sitting around IIRC. So no real in-depth feedback from long term use, that I know.
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Old 02-22-2012, 04:09 PM   #30
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Interesting thing I noticed

Here is a picture of the end of the A1 (MAPerformance) bolts. This is there "dog point" design they use


Here is a picture of the ARP 625+, also featuring a 'dog point" design


Someone a while back told me A1 made all the "higher end" (L19, H11, CA625+) stuff. I wonder if that is still true today.
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Old 02-22-2012, 04:33 PM   #31
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Quote:
Originally Posted by Homemade WRX View Post
The MA performance bolts, I have heard good things about them. Which variant?
I am using the H11 / L19 variant because I didn't know they offered other materials. So far no problems. Car runs amazingly and has held onto all of it's coolant without filling the overflow bottle since July. It is not daily driven and lately with the weather conditions, it's only been driven on average of once every other week. Since july I have only put about 2200 miles on this engine. With 1500 of them at 16 psi, 500 at 20 psi, and 200 at 28 PSI.
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Old 02-23-2012, 10:23 PM   #32
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P&L Studs here. I have the RCM ones in my hands as well.. Honestly I don't think TQing the head to 100000000000 ftlbs is the right way about it anyway.

The reason the bigger studs work better IMO is that they provide the head with basically 6 dowls to hold it true and keep it from twisting/lifting. Then you have the added area of the washers clamp load. These cars are not EVO's and what works on a closed deck iron block with not really mesh well on a semi deck in aluminum.
I mean you have evos/supras going 9s/8s on stock studs... It just cant be compared to a EJ motor.

Stock liners, P&L big studs and 40+psi have been through quite a few motors at P&L with no head lifting. Just watch the violent antilag on the 6spd car, that is what lifts heads.. No issues with it at all.
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Old 02-24-2012, 12:52 AM   #33
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I have the 625 and ran 28-30 psi through my borg 75/70 (s200sx) for ~13k and had no headgasket issues
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Old 02-24-2012, 09:12 AM   #34
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Quote:
Originally Posted by Junior2JZ View Post
P&L Studs here. I have the RCM ones in my hands as well.. Honestly I don't think TQing the head to 100000000000 ftlbs is the right way about it anyway.
The first thing I did was call P&L for the studs. I saw a lot of fast cars running them, and figured it was a clear cut solution. They should work on stocking more of them. I called about them 2 months ago, I was told a month. I called a month later, and was told it was going to be another month. At this point the motor will be done in that time, and if I wait and call in another month... well you know the deal. Race season is almost here.
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Old 02-24-2012, 09:21 AM   #35
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Quote:
Originally Posted by No Limit Motorsport View Post
The first thing I did was call P&L for the studs. I saw a lot of fast cars running them, and figured it was a clear cut solution. They should work on stocking more of them. I called about them 2 months ago, I was told a month. I called a month later, and was told it was going to be another month. At this point the motor will be done in that time, and if I wait and call in another month... well you know the deal. Race season is almost here.
It's not like you were asking for an EFR from BW...
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Old 02-24-2012, 09:23 AM   #36
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It's not like you were asking for an EFR from BW...
LOL I wouldn't dare. You have a better chance of finding the holy grail than getting some of those...
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Old 02-24-2012, 10:12 AM   #37
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^^^up, just found the Holy Grail, now where's that EFR? That was child's work compared to getting an EFR

The only reason I haven't tried the P&L is Darton East (who I've been spec my builds through for the last 18 months), refuses to use them because of the tapping procedure. They don't like tapping over still existing threads. I've never tried the P&L's nor tapping, so I really can't varify but the numbers stack up.
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Old 02-24-2012, 11:55 AM   #38
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Quote:
Originally Posted by ASF Machine View Post
It's not like you were asking for an EFR from BW...
That is hilarious. BW released a bunch of EFR's and the sizes were all stooopid.

My money is that when the good sizes are released everyone will have to buy them from full race. BW/Full race are gingerly touching their tips together behind the scenes.

To keep my post on topic, I'm a little biased but I'm running MAP H11's with OEM gasket.
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Old 02-24-2012, 12:07 PM   #39
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Yeah, I think I have a set of MAP H11's on the way that I plan to stick into my 4" bore destroked engine. They'll be replacing the old ARP2000 hardware.
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Old 02-24-2012, 12:08 PM   #40
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You think you have a set? Let me know what name they would be ordered under and I will check for you lol.
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Old 02-25-2012, 12:35 AM   #41
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I just remembered I have 2 set of RCM headstuds for sale. I never posted them. They were TQed and never run. Complete setup

Anyone that wants them PM me for more info.
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Old 02-25-2012, 07:42 AM   #42
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Quote:
Originally Posted by Homemade WRX View Post
Yeah, I think I have a set of MAP H11's on the way that I plan to stick into my 4" bore destroked engine. They'll be replacing the old ARP2000 hardware.
What kind of dish is on that 4" bore piston? What's your belief on higher power dish design?

Jr, same question to you.

P .S. happy weekend boost bros
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Old 02-25-2012, 05:54 PM   #43
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Originally Posted by soon2bblackongold View Post
What kind of dish is on that 4" bore piston? What's your belief on higher power dish design?

Jr, same question to you.

P .S. happy weekend boost bros
It's just one of my old 4" setups, that is actually two crown generations old. It's a large quench pad with sharp break, shallow dish. It should be around 9.3:1 on my B25 heads. They're so old, the predate JE having FSR pistons


Junior, you have a text about the studs.

Last edited by Homemade WRX; 02-25-2012 at 06:04 PM.
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Old 07-26-2012, 12:51 PM   #44
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bump for more results from anyone.

I'm about to give the 625's a beating and I'm contemplating those vs the 13mm...
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Old 07-26-2012, 12:56 PM   #45
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Originally Posted by Maxwell Power View Post
bump for more results from anyone.

I'm about to give the 625's a beating and I'm contemplating those vs the 13mm...
I been running 27-28psi every day with out pushing any coolant, I am going to raise it when it get coolers probably to 30+ psi
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Old 07-26-2012, 12:58 PM   #46
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Quote:
Originally Posted by juanmedina

I been running 27-28psi every day with out pushing any coolant, I am going to raise it when it get cooler probably to 30+
Two cars I've tuned 27-28psi on stock head bolts (reused). No heads lifting/coolant pushing through.
58-59mm turbos though

I think you need mo' boostz
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Old 07-26-2012, 01:29 PM   #47
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Quote:
Originally Posted by Maxwell Power
bump for more results from anyone.

I'm about to give the 625's a beating and I'm contemplating those vs the 13mm...
Oh no I'm scared now lol
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Old 07-26-2012, 01:34 PM   #48
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Originally Posted by Nuke209 View Post
Two cars I've tuned 27-28psi on stock head bolts (reused). No heads lifting/coolant pushing through.
58-59mm turbos though

I think you need mo' boostz
......

the amount of boost for dd cars keeps getting higher and higher each year,,,, as well as turbo sizes

I remember when people used to said that running over 22psi was crazy haha.

Junior run 40psi on his 100% stock long block with a HTA35r for a little while before he swap the engine
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Old 07-26-2012, 01:35 PM   #49
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Oh no I'm scared now lol
... GL
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Old 07-26-2012, 01:57 PM   #50
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I did up to 29 on my arp2000's a while ago. Didn't seem to have any issues. Wonder how high Dom will go with the 625's hahaha. Not sure if my clutch can handle anymore torque lol
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