Piston Bowls

[McRat]

Just wish I knew how or why.

Perhaps something like loop scavedging (sp)?

The gases will create a dual pattern loop when the valves open?

That is how two-strokes work. In their case, it increases power a bunch. The transfer ports are aiming into a dual loop to push out the exhaust.

 

[malibu795]

what are you running for rods>?

lbz rods..
current hp is 250. untill the 4l85 gets built im not increasing HP.

goal is 360-400 fwhp with a non VVT turbo.. i dont see the point in increasing any more then that.. thus it doesnt warrent HS/MS/rods IMO.. have thought about valve springs and rocker shaft studs..
going from 4.63 to 4.10 gears.


installed oil temp sensor in the 1/2" npt boss on the oil filter housing.. pre cooler.
engine is a long block now... got a couple more hours worth of work and it will be in the truck.. late tonight

 

[malibu795]

Up an running head to Wisconsin with a heavy high sail load.. wonder how fast the rings will seat

 

[MACKIN]

Good luck!

 

[JoshH]

That was quick!

 

[05_LLY]

That was quick!

I agree, did u do complete overhaul/machine work/rebalance?

 

[malibu795]

I agree, did u do complete overhaul/machine work/rebalance?

Bored and balanced... everything else was in spec.... didn't see the reason todo more new std bearings and polished the crank

 

[05_LLY]

Cool deal Adam, thinking of a set of these pistons myself!! Good luck!

 

[blackdirtymax]

Decided to pull the trigger on a set if these in forged , hope to put them thru a hard work out .

 

[emiller3]

Good deal Trey:thumb:

 

[malibu795]

and im back... ~1100 miles i think i broke 10mpg on the last tank... first tank was 8.1 second was 9.1..

been pulling timing out like crazy.. up to 10* in spots to reduce the igniton rattle/pinging. on the part throttle where i usually ran 10-15* @ 2500 with no rattle with stock im down to 7-9* still little noisier then stock pistons... it was rattleing like a 6.5 under a load.. also as i pulling timing engine responded better still not snappy like stock was but i have a broke in engine and 45k to prefect the tune...

cruise rail pressue it 20k stock going to bump that up to 26k. it will allow me to get the fuel in there quicker and at a better atomization for better burn.. it was worth ~2mpg on my LB7 in cruise.

while driving.. been thinking the difference between stock and finger bowls... wherre stock has one big hotspot.. fingers has basicly two small hotspots allowing the fuel to ignite faster thuse creating the ignition rattle where the stock pistons didnt.. also anothing to note the bowls are shallower then stock as well making them naturally closer to the head

 

[Fingers]

Actually, the long side bowls are deeper than stock.

 

[malibu795]

minor technicallity.. i stil think the principle that i was trying to explain doesnt change

 

[MarkBroviak]

http://www.youtube.com/watch?v=HaNM8fiKNPc&feature=youtu.be

Not the best quality video but I think it may help some with your questions. This is the smallest tune that I have had to detune twice to get it to calm down some. Regardless it is a blast and traction is always an issue for me even on the smallest tune. Hope you enjoy!:hug:

 

[malibu795]

looks like fun!!

 

[coker6303]

Sounds more like a ford, but I can't hear real well on my phone

what's your goal hp mark?

 

[malibu795]

not fancy like marks... shot this leaving a toll booth in chicago yesterday
http://youtu.be/bR0t5GE96Zc
this is the load.. ~5600lb genset

 

[whitetrash21]

Almost has that 2 stroke Detroit sound at times..... and damn, that 72 likes to talk

 

[LReiff]

My LB7 has a similar sound. The camera doesn't record sound good.

 

[sickdiesel]

http://www.youtube.com/watch?v=HaNM8fiKNPc&feature=youtu.be

Not the best quality video but I think it may help some with your questions. This is the smallest tune that I have had to detune twice to get it to calm down some. Regardless it is a blast and traction is always an issue for me even on the smallest tune. Hope you enjoy!:hug:

driving home on a closed course tho right :roflmao: