Power Crater vs Flat Top

Power crater pistons have more crevice volume making them ineffecient and flames are seen out the exhaust from the trapped unburned fuel. What I agreed with rod on his power comes from the compression increase and not squish . What i posted in another post to keep from getting to far from topic is that the squish from a m@w piston has no kinetic energy and once the secondary squish pressure wave  happens its done cause it has no kinetic energy to keep charge turbulent through the complete combustion cycle. 

Rod B Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 25 Jul 2011 Location: Peoria Status: Offline Points: 201

Post Options Post Reply Quote Rod B Report Post    Thanks(0)    Quote  Reply Posted: 19 Nov 2012 at 2:32pm

It comes from the compression increase when people install the flat top pistons for a 4" stroke in an engine with 4 1/2" stroke.   Piston design can help with a power increase but in this case it's from the increase in compression.  The pistons are down in the bore to far from the head to have the piston top make the change.  M&W used a vane in the piston head to help cause turbulance during compression stroke, probably the best designed piston.   Most of the aftermarket kits I have seen use a large concave dish in the piston and vary the compression for the engine by wrist pin placement                                  What I and Rob agreed on is the power increase comes from the compression increase and not squish

Edited by mlpankey - 30 Nov 2012 at 6:48am

has anyone  else lost track of the originall conversation? i am so confused by all this back and forth bickering. i would have to assume that the guy building his motor for pulling should know what his tolerances and thickness's are. i would also come to conclude that if you are going to build a fairly peppy motor such as a pulling motor that you probably should not be some complete idiot and not know what you are doing.

Without knowing other factors neither you or I can calculate that.

Do not worry about his squish velocity, work on your measureing skills or at least tell the forum you lied or made an honest mistake.

I may be off of someone elses measurents by .001" or .002", you're off by .020".   Go buy a gasket and see for yourself.

This whole time you tried to argue about something you didn't know, or used inaccurate measurements. The gaskets have been that thick for as long as I have used them. 25+ years. Glad I could help once again.

Edited by Rod B - 25 Nov 2012 at 9:00pm

mlpankey wrote: Feelpro gasket is. 045 straight off the shelf. Victor renz want hold the compression maybe rod should try again. Actually think its. 042 but whats .003 assuming the block has been decked and rod thermal growth has been acounted for. Rods calcs would bte off no more than. 010

A Fel Pro is .061" off the shelf and a victor is .063". Compressed Fel Pro is .052"

Does anyone suppose if anyone else had posted the same information that I did, there would be such a problem?  I'd bet if I posted that I had flat top pistons in one, then we could hear about how it's more prone to detonation than some other combo.

Don't think you can read well pank. My post was in favor of Wi50 also my intentions not aiming at Rod either. Just don't get why you intend on putting people down ?? Some of the stuff you say is good Pank but not consistent ! Lets face it readers or any followers are more acceptable to watching or learning from consistency than a one time winner. As fellow pullers sharing information is valuable to the young crowd. Where else will we find competion in near future? The moderator needs an apology! My calendar joke was to break the ice and talk about something else. Or we just need a cool pulling calendar and apply the funds to a good cause.
Done with this gonna read the classifieds need parts .

I Like boobies also !! Even muddy boobies!! But once again some guys need to argue too much. ( gay) (creepy) just not cool . Need a pulling tractor naked girl calendar to all in check here

wi50 wrote: you two are downright creepy.  I seen Rod once at a GOTO and never seen Pankey that I know of.  Maybe they have more in common than they let on....  It's no wonder neither of you two have time to work on any engines or go to any events.  They make pills for these kind of of things.  I like women with low IQ, large breasts and low self esteam, I do not like guys with the same qualities.

connecting rod grows more than the pushrods do . wi said it was .010 out of the hole . pistons errode from to tight of quench. Have marty since he states he uses a cam grinder in denver nc to  ask mr. jones about the valve lash issue . He was the one that brought it to my attention that lash increases hot instead of decreases and it got about the same responce when brought to my attention as it did when i brought it to somes attention on this site.  Yes your mad that you didnt figure thermal growth of the connecting rod in the above and i pointed it out . So once more you combat it with name calling as usual  butting in on a question that was directed to your boyfriend and not you in the first place . It was a simplistic question if answered we would have known if he hit the sweet spot or missed it by what he observed on the piston top. He didnt so around the world I went with you . Oh if you and marty arent the same person rod dont try to act like you know people in the same circle as I you proved that was just a fake try by the rawlings move instead of his correct last name rawls.  However feel free to keep reading my post your knowledge is coming along  fine with every read post  even if you miss up the names somewhat in a futile attempt to discredit .

Edited by mlpankey - 23 Nov 2012 at 6:53am

Yep doc it takes verry little timing when high static ratio are involved rod ithe am glad that you now see wi quench running is less than his cold measurement. So yours and his calculation would be off no more than. 010 one would have to make a hot oil bath and measure the rods center to center after thermal growth and have that number equated in like race engine builders do with a little fudge factor for rpm stretch.

The expansion rate of steel is more than that of iron. Aluminum expands more than steel. Pistons don't erode from being in a well designed quench engine and valve lash tightens slightly when the engine warms up. No matter what pankey thinks all these things are prove facts.

I think of all the race engines built to run on tight quench. If pankey was right the clearance would increase as the engine warms up. We all know it decreases and good builders target a tight quench.

At least pank can now admit he was wrong and valve lash tightens with heat.

Edited by Rod B - 22 Nov 2012 at 8:25pm

Posting different numbers now than other times. Getting caught lying quite often.

A compressed fel pro is .045". But with your measureing and math skills it's no suprise that you can't give an honest answer.

A compressed head gasket is .052". With the .010" piston protrusion that engine is right on the money.

We are not talking about domes or chambered heads.

Time for pank to try and fool someone else. His contradicting arguments go round and round.

Edited by Rod B - 25 Nov 2012 at 8:46pm