Liftin' heads

How to make it go fast

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Re: Liftin' heads

Postby spencerdiesel » Wed Dec 26, 2018 7:02 pm

A particular ARP stud that ya'll reccomend for said studding?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing to the head/ >1/4”
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Minimum 60% WMO full time since Sep. 2018
spencerdiesel
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Re: Liftin' heads

Postby DMan1198 » Thu Dec 27, 2018 12:39 pm

I have 625’s in my 4th gen. They’re around $1200 a set though. I want to put 625’s in The Roo Hunter though.

One at a time method is remove 1 bolt, finger tight, then back off half a turnish the stud, lube threads, both sides of the washer, and bottom of the nut, install, torque to 100ft-lb, continue to next bolt, once all studs are in bring to final torque. I’m not 100% on the short ones final spec though, as all the 24v bolts are the same length.
Ducati- professional nap taker, and thread derailer extraordinaire
Brownie: 80 dodge heavy half. Ghost cummins under the hood, and some sinister plans
The Roo Hunter: 93 w250, lifted, 2 whistle machines, and a bunch of other go fast goodies, uhh..... not there yet
Jaeger: 12 ram 3500. Lifted, exhausted, and fed an excessive quantity of air
The Huntress: 02 Jetta TDI. No muffler, egr, horsepower
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Re: Liftin' heads

Postby spencerdiesel » Thu Dec 27, 2018 6:54 pm

Thanks for the in-depthness Dman. More often than not I need the drawing done in red crayon.

Im ignorant of studs. Other than being uber stout, why is the price so stratospherical?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1068
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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Re: Liftin' heads

Postby DMan1198 » Wed Jan 02, 2019 12:45 pm

Probably a similar reason as to why titanium is expensive. The metal isn’t just forged steel, and they don’t rust at all.
Ducati- professional nap taker, and thread derailer extraordinaire
Brownie: 80 dodge heavy half. Ghost cummins under the hood, and some sinister plans
The Roo Hunter: 93 w250, lifted, 2 whistle machines, and a bunch of other go fast goodies, uhh..... not there yet
Jaeger: 12 ram 3500. Lifted, exhausted, and fed an excessive quantity of air
The Huntress: 02 Jetta TDI. No muffler, egr, horsepower
DMan1198
14mm rotor
 
Posts: 2220
Joined: Sat Aug 10, 2013 6:26 am
Location: Slave Lake, Alberta
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Re: Liftin' heads

Postby spencerdiesel » Sat Jan 05, 2019 10:56 am

Ok that’s what I figured. Went to put the pump the rest of the way to the head and it seems pretty much bottomed in the slots already.

I notice on the 3 Studs holding the IP they seem to have a shoulder past the threads. When the IP is bottomed all the way against the studs, is there normally about 1/16” space between the threaded part of the stud you see and the edge of the IP slot?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1068
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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Re: Liftin' heads

Postby PToombs » Sat Jan 05, 2019 6:25 pm

Sounds about right. You might be able to squeak a little more, but not much.
pete

Just enough power to break everything behind the crankshaft.
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Re: Liftin' heads

Postby spencerdiesel » Thu Jan 10, 2019 8:24 pm

Ok so for whatever reason, the last 1/16” the pump went before bottoming gave quite a noticeable jump in time. It actually has a little rattle on waste oil.

It pulls great on top. Even after over 1/4” of advance I still haven’t noticed any loss of bottom end like most seem too. Of course the snail lights slower, maybe a lot of people notice that most? And in my case with oil burning slower than diesel, I’m sure my combustion event is more similar to say an 1/8” bump on diesel.

There’s less smoke just about everywhere now compared to being at 3/16”. Got my non IC afc spring dialed and it’s a perfect haze to spool fairly decent.
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1068
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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