LB7: Motor Build thread

TrentNell

TrentNell

Finally underway !!!!!
Jul 7, 2008
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slc tuah
S Phinney said:
Don't have the answer to that one Ben but all the small things are what make the differences. I know one racer, and he is big time, that doesn't believe in the small things when assembling. Needless to say they break a lot and didn't make it to the finals and they have been champions for mulitiple years. I guess his philosophy is that they will pull it apart enough in between that the small things don't matter. Good luck with the build Trent. Hopefully it will prove useful to a lot of us in the future.
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Ya i dont know Shane,The last thing I want is to get into a pissing match about what is nec. I am just going to run the motor for a while with what i have planned and see what happens , I would like to see some signs of my own on certain issue's instead of just throwing the kitchen sink at it because i am scared . I have alot of plans for the next motor , including forged pistons , Girdle/main studs , o-ringed heads ( if i find its needed ) , maybe aftermarket crank , stroker , who knows . In a sence i am starting my own motor program and will see what happens . This motor is going to be decent just a low buck build , and as long as my rods dont get taken out i would not be out much if it failed . I have seen some motors fail even after having the kitchen sink thrown at them so i want to start from scratch .

My build

all new main and rod bearings clearence set to .004 ( I think... i wrote the spec down )
cut cam and crank with key ways (done by me )
cut pistons - (15:1 compression with a custom home cut job removing all material out of the bowl to get a low compression and keep a tighter "quench" and a radiused lip )
Howard Xbeam rods
I am re-using piston rings
ARP head studs
So Cal billet injector hold downs
DPR valve springs , titanium retainers
 
Last edited:
othrgrl

othrgrl

Diesel Addiction Owner
Mar 10, 2008
2,151
4
38
Wilmington NC
www.mydieseladdiction.com
duratothemax said:
how much extra hp is a torque plate hone good for????
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You could be losing a pretty good amount from the blow-by caused by having cylinders that are out of round - rings can't fully seat on cylinder walls that have 6 bulges in them. Jeff's main point is that while all of the little details may not add tons of hp, they all add up and can mean that .04 you won a race by, that 6 inches you won a pull by, or that 10 hp you won a dyno event by. And even more importantly to most of us - the extra races and pulls you made it to on the same build, or the extra 15,000 miles you put on your built motor.
 
S

Smokin LB7

New member
Jul 25, 2008
191
0
0
TrentNell said:
Ya i dont know Shane,The last thing I want is to get into a pissing match about what is nec. I am just going to run the motor for a while with what i have planned and see what happens , I would like to see some signs of my own on certain issue's instead of just throwing the kitchen sink at it because i am scared . I have alot of plans for the next motor , including forged pistons , Girdle/main studs , o-ringed heads ( if i find its needed ) , maybe aftermarket crank , stroker , who knows . In a sence i am starting my own motor program and will see what happens . This motor is going to be decent just a low buck build , and as long as my rods dont get taken out i would not be out much if it failed . I have seen some motors fail even after having the kitchen sink thrown at them so i want to start from scratch .

My build

all new main and rod bearings clearence set to .004 ( I think... i wrote the spec down )
cut cam and crank with key ways (done by me )
cut pistons - (15:1 compression with a custom home cut job removing all material out of the bowl to get a low compression and keep a tighter "quench" and a radiused lip )
Howard Xbeam rods
I am re-using piston rings
ARP head studs
So Cal billet injector hold downs
DPR valve springs , titanium retainers
Click to expand...

Could you please explain your piston compression design. Are you basically just taking out that bulge that is in the middle of the bowl? And taking some of that inside lip out? And thats how your dropping compression?
 
TrentNell

TrentNell

Finally underway !!!!!
Jul 7, 2008
7,543
0
0
44
slc tuah
Smokin LB7 said:
Could you please explain your piston compression design. Are you basically just taking out that bulge that is in the middle of the bowl? And taking some of that inside lip out? And thats how your dropping compression?
Click to expand...

I will post pics when its done , I am not touching the middle of the bowl .
 
Bako_Dmax

Bako_Dmax

GTO Slayer
Apr 3, 2008
657
0
0
Bako
To bring back what was touched on earlier, twins make a lot of tq which is probably why TrentNells rods bent. Then nitrous was brought up, doesnt nitrous create a ton of tq? Or do diesels react differently as opposed to when its used in a gasser. My exprience with nitrous (only in gas) is it produces nearly double the tq compared to the HP it produces.
 
Stingpuller

Stingpuller

The Pusher Man
Jan 11, 2007
2,019
35
48
57
central Ohio
Motors

I didn't have my post as a slam on Trent's build. I'm sure his build will be fine. When a block moves .004 or more that can't help ring seal. Just think "if" it moves .004 then you won't have a lot of clearance in them spots for piston to wall. I'm not trying to tell anyone how to build a motor, I just hate to see someone have problem's or not get what they want from there build. Jeff
 
TrentNell

TrentNell

Finally underway !!!!!
Jul 7, 2008
7,543
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0
44
slc tuah
Stingpuller said:
I didn't have my post as a slam on Trent's build. I'm sure his build will be fine. When a block moves .004 or more that can't help ring seal. Just think "if" it moves .004 then you won't have a lot of clearance in them spots for piston to wall. I'm not trying to tell anyone how to build a motor, I just hate to see someone have problem's or not get what they want from there build. Jeff
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I never took it that way Jeff , You are stating the truth simple as that . You have built alot of top notch motors Gas , and Diesel .
 
S

S Phinney

Active member
Aug 15, 2008
4,008
18
28
Quncy, Fl
Trent I know what you mean when your talking about an economic build. I think with your build and abuse it will see a lot of us should get some valuable insight on making the absolute necessary refinements for the motor to live. You're always out there pushing the limits and we will get a better idea of where some of those limits fall. Can't wait to see how its going to perform for you.
 
TrentNell

TrentNell

Finally underway !!!!!
Jul 7, 2008
7,543
0
0
44
slc tuah
Cut my pistons last night , it was pretty cool , I did all the machining myself so it was fun to learn , just a touch scary because i had never cut a piston before but was really fun to play with the lathe . I have know idea how these are going to work , nor what differs from how other cut there pistons , i did it by what i felt needed to be done , compression should be 15.0 ............ zero off the top............. all taken out of the bowl , and the radius is decent sized IMOP , I did it with hopes of helping with heat . Like i said I am in no way saying this is the best way to do it but i am going to try it, and like they way they turned out .

I still need to cut my key ways ( no time last night ) so maybe I can start re-assembly next weekend .
 

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02bigstrokin

02bigstrokin

New member
Sep 9, 2008
882
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looks good trent, what did you open the bowls up to. on mine we took .010 off the top and delipped the bowls to 2.5 and guy said that would put me at about 16.5. just wondering.
 
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