Bent Rod cylinder 7 L&M Rebuilt

[PC 2015]

Edit update: Gen3 with a gen5 whipple.

Kaspers korner pulled the motor and L&M is building it.
Cylinder 7, bent rod, broken piston skirt. L&M Engines received the motor 5/29 and will be done Tuesday 6/4 I'm told. So one week start to finish. Will have more pictures soon.

Build is their L&M 2100 short block witch is Sleeved block, Manley I beam rods, forged pistons, ARP everything. Decked the headed. It will be good for 1200/1300whp.

View attachment 368751

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[olaosunt]

I vote 12:1
Good luck man

 

[Rjames18]

Correct me if I'm wrong.

With 12:1 you don't have to spin the blower as fast and can use a larger pulley thus not putting as much stress on the crank.
With 11:1 to get the same power as the 12:1 ratio you would need smaller pulley, more stress on the crank, more stress on the blower from having to spin faster.

 

[PC 2015]

Correct me if I'm wrong.

With 12:1 you don't have to spin the blower as fast and can use a larger pulley thus not putting as much stress on the crank.
With 11:1 to get the same power as the 12:1 ratio you would need smaller pulley, more stress on the crank, more stress on the blower from having to spin faster.

Yes you would have to spin the blower faster. Not to much tho. Lund said 1 point is like 40 to 50whp. But no more stress on the crank. But it is much safer to run 93 with boost 11-1.

 

[Rjames18]

Yes you would have to spin the blower faster. Not to much tho. Lund said 1 point is like 40 to 50whp. But no more stress on the crank. But it is much safer to run 93 with boost 11-1.

Explain how it would be safer if you're aiming for say 700whp. As soon as you add forced induction you're increasing the Compression Ratio in the combustion chamber exponentially. With 12:1 it wouldn't require as much force from the blower but wouldn't you still end up at around the same total compression to make 700whp?
Would it not be easier for the 12:1 CR to make this due to requiring less boost?
Anytime you pulley down that would add more stress to the crank as that is where it is pulling from.

I could be wrong on all of this as I haven't done much research myself.

 

[PC 2015]

On e85 no problem but on pump 93 higher compression is less forgiving. Lund jr recommended if I planned on running I may want to step down to 11-1 or even 10.5-1 it would be safer on 93 pump. Dont know the science behind it . Lund jr tunes a thousands of cars and if he tells me lower compression on pump is safer I'm gonna listen to him.

 

[F1scamp]

How hard were you leaning on it that you broke it? Just curious.

 

[ahl395]

If your running 93 sometimes I would do the 11 to 1. You'll still have plenty of room left on the blower to make power on E85 with the 11 to 1. If you were near the limit of the blower I'd stick to 12:1 but it doesnt seem like you are.

What broke it??

 

[PC 2015]

How hard were you leaning on it that you broke it? Just curious.

If your running 93 sometimes I would do the 11 to 1. You'll still have plenty of room left on the blower to make power on E85 with the 11 to 1. If you were near the limit of the blower I'd stick to 12:1 but it doesnt seem like you are.

What broke it??

Wasn't pushing it hard at all. Whipple tune when it got hurt. When I changed the plugs before I started logging with Lund there was a very very little dot of oil on the cylinder 7 plug. With the whipple tune had 2 or 3 misfire. Witch found a few other 19 with same tune had this problem. So long story short got cylinder 7 is out. I'm staying 12-1 with Lund tune this would of not happened.

 

[sigintel]

12:1 if you add the EGT sensor either stainless thru stream or welded on outside header (just keep in mind slight lag in sensor response). Assuming you will get hooked on E85 and get crazy. You can get a used large propane above ground residential tank and convert it to E85 storage. Looks like typical 500 gal propane tank from outside. ... if you work out how to fill it as needed.

Hmmm... considering philly gas quality...
You will be grabbing 93 and near traction limit, are you really going to drive extra to get E85 if it just adds more wheel spin?

Extra summer tire set of NT01, RE71R, MT, Hoosier..?

Id say 11:1 and log for a whole year across the fuel blend change and see if you hold max timing advance on 93. If not, E85 and pulley down, repeat.
Leaning towards 11:1 and give up the 6-8% max power. Increase durability and margin in variable fuel quality and tune. You trash another motor at 12:1 youll be pissed.

 

[Andy13186]

Wasn't pushing it hard at all. Whipple tune when it got hurt. When I changed the plugs before I started logging with Lund there was a very very little dot of oil on the cylinder 7 plug. With the whipple tune had 2 or 3 misfire. Witch found a few other 19 with same tune had this problem. So long story short got cylinder 7 is out. I'm staying 12-1 with Lund tune this would of not happened.

Sounds kind of like the youtuber coyote car guy. His whipple stage 1 with like 630 rwhp blew the engine with the whipple tune.

Could you go 11.5 to 1 and split the difference maybe?

 

[ramirj2]

Explain how it would be safer if you're aiming for say 700whp. As soon as you add forced induction you're increasing the Compression Ratio in the combustion chamber exponentially. With 12:1 it wouldn't require as much force from the blower but wouldn't you still end up at around the same total compression to make 700whp?
Would it not be easier for the 12:1 CR to make this due to requiring less boost?
Anytime you pulley down that would add more stress to the crank as that is where it is pulling from.

I could be wrong on all of this as I haven't done much research myself.

We need a crank support! Now I’m paranoid with the fact that no matter how strong is the bottom end built, it is based on the same crankshaft.

 

[Tommy V]

How much power were you making on straight 93,is a good place to start.Our 93 in maryland sucks.

 

[Old Ickabod]

On e85 no problem but on pump 93 higher compression is less forgiving. Lund jr recommended if I planned on running I may want to step down to 11-1 or even 10.5-1 it would be safer on 93 pump. Dont know the science behind it . Lund jr tunes a thousands of cars and if he tells me lower compression on pump is safer I'm gonna listen to him.

This...
Sounds like 93 is easily available for you, you'll get better mileage and you can still make plenty of power (especially for the street) with lower compression on 93.
I'm running an aluminator sc short block (9.5:1) and still making pretty good power on 93.

 

[PC 2015]

How much power were you making on straight 93,is a good place to start.Our 93 in maryland sucks.

What up Tommy, the thing is tho there tune is based off 91. Dont matter tho. What's done is done now. From here on out. If I run 93 it will be with boostane from here on out. But E85 is what I'll be running 90%of the time

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