Devils Mentor

iTrader: (20)

Oh and BTW... Wisco has, from my understanding, perfected the skirt to shallow cylinder issue with the 6.0 running a big stroke crank.

DM

red 95 t/a

Nice my brother was acttully looking at the wisco stuff lol

93ls7z

iTrader: (2)

We bored the block to 4.125" and used a 4.100" crank.

3pedals

iTrader: (3)

On an iron 6.0 4.00" bore block????

Devils Mentor

iTrader: (20)

I'm with 3pedlals, how? Did you sleeve the block?

DM

waynehartwig

Bump for an answer

allan808

iTrader: (3)

^^^ what he said?

racer7088

We do a 427 for NA only with the 4.100 cranka nd a 4.060 bore and it lasts forever but the piston is too short for large power adders.

The 408 is easy and super versatile with a ton of piston choices so that's the one we do 90% of the time.

waynehartwig

Sorry, don't mean to hijack your thread. I have a question that is kind of in line with yours...

What kind of numbers could I expect out of a 418 - 4.030 bore and 4.100 stroke? I know HCI can make or break the numbers, but...

I'm looking at this kit from Eagle:
http://www.summitracing.com/parts/ESP-B12824030/

also, would it be safe to spin this motor at ~7000 rpms? 800 hp/tq? ~16:1 compression? Fuel is no big deal, I can run % nitro if need be....But right now I'm shooting for E85.

I'm really stuck between building an LS motor or going BBC and big cubes. I know I can get big cubes/hp/tq out of a ~572. But I'm weighing in the LS possibilty.... I like that they are lighter and etc.

racer7088

BBC is much easier to make 800 hp. LS1 can do it as well but not as easy and would need to be a real race type engine. You can't beat cubes.

waynehartwig

That is absolutely my dilemma! Do you think the 418 would make 800 hp, NA?

As of right now, I'm thinking that I need at least 800 hp/tq at ~6-7000 rpm, without power adders. If that's not very doable, then I have my answer.

racer7088

A 572 can make that easy since teh BBC heads are also very large and can flow big air and the 170 extra inches will bring the rpm down a lot. The downside is a much heavier and larger engine.

A solid roller 408 can make 800 hp with good parts and race gas easy enough as well but it will be at higher rpm and will probably not last as long.

Devils Mentor

iTrader: (20)

Hey Erik,

The setup that I may be having you build will be a LQx with a 4.125 crank and 6.125 rods; as for the pistons, I currently have Wiseco .005 so I'm looking at a 415, but may go with a .05 for a 425, but not sure yet.

Anyways, would I be able to us a little juice, say 175 shot, with such a short skirt?

DM

Duntov1967

iTrader: (22)

What length rods do you use with a 3.9" stroke? Do the pistons have to be custom made?

racer7088

Probably should be able to.

LS6

Has any one bored the lq4 or lq9 to 4.0845" and beenused with no problem?
From what i understand, that 0.18" wall thickness is good for NA.

Can any confirm

racer7088

Not so far but if you could sonic check it might be a possibility but we have never done ant that far out.

LS6

I done some simple math:

the water jacket will be exposed at 4.275" bore, thus lets assume that the boundary limit for the water jacket (W.J.) is 4.275". To calculate the remaining thickness with 4.000" bore:

-W.J..: 4.275"
-6.0 Block OME Bore: 4.000"

Thus avilabe thickness: ((4.275" - 4.000") / 2) = (0.275" / 2) = 0.1375" = 3.4925mm


If we bore the cylinder block to 4.060", the remaining thickness would be:
((4.275" - 4.060") / 2) = (0.215" / 2) = 0.1075" = 2.7305mm

If we bore the cylinder block to 4.085", the remaining thickness would be:
((4.275" - 4.085") / 2) = (0.19" / 2) = 0.095" = 2.413mm

The remaining thickness is almost 2.4 that I assume can handel the N/A engine

Thanks...

racer7088

There is usually core shift so the thickness is never uniform at all unfortunately.

LS6

Thus, from experence what is the nominal diameter that the water jacket wall won't be structurally stable to hold the water pressure and the combustion pressure?

In my opinion, i think 4.1 would be the maximum with condition:
-cooling water shall be always maintained.
-programming to be safe margine from the border limit of detonation.
-compression ratio shall not be more than 11.5:1.0.
-the engine shall be natural aspirated.

this is my opinion