Stroker
05-18-2006, 03:17 AM
#12
1st Gear Member
Join Date: May 2006
Location:
Posts: 106
RE: Stroker
Lol, sorry for getting to technical, theres really no easy way of explaing it. But you learn it real quick when you start dealing with it all the time.
a formula we always used in circle tracking to determine the max rpms we should turn with the stroke that we had, is
Max Piston speed (Ft/min) x 12, divided by stroke x 2 = Max RPM Limit
Example for a 3" stroke; 4500 x 12 = 54,000, divided by 6 = 9000
4500 ft. per min is about where even the best of parts (including forged) start geting pushed to hard.
a formula we always used in circle tracking to determine the max rpms we should turn with the stroke that we had, is
Max Piston speed (Ft/min) x 12, divided by stroke x 2 = Max RPM Limit
Example for a 3" stroke; 4500 x 12 = 54,000, divided by 6 = 9000
4500 ft. per min is about where even the best of parts (including forged) start geting pushed to hard.
05-18-2006, 03:18 AM
#13
6th Gear Member
Join Date: Sep 2005
Location:
Posts: 5,128
RE: Stroker
Now I don't want to jump to any conclusions here, I really don't. But cobrapony27... it sounds like you know what you are talking about.
that's some cool information. Now with circle track racing, is that almost constant RPM on the engine? I don't know much about it
that's some cool information. Now with circle track racing, is that almost constant RPM on the engine? I don't know much about it
05-18-2006, 03:37 AM
#19
1st Gear Member
Join Date: May 2006
Location:
Posts: 106
RE: Stroker
Getting a place to do your own work thats cool, having to replace valve stem seals... not cool.[:'(]
i just found a article i saved that explains this a little more:
"Fitting longer than stock connecting rods to an engine increases torque and hp. They have become standard items in high out race engines. (It has to do with the pistion spending more time at the top of the cylinder when the spark plug has just fired the fuel, and less connecting rod angle.) Advantages include a much lighter pistion than is possible with the stock length rod, giving it quicker accerlation and less reciprocating pistion weight. This DOES NOT change bore, stroke, engine displacement or compression ratio. The rod is longer and the piston is shorter but the final deck height is the same as "zero deck".
And heres a few other articles that explain some basic stuff:
torque and horsepower
Engine technolgy
i just found a article i saved that explains this a little more:
"Fitting longer than stock connecting rods to an engine increases torque and hp. They have become standard items in high out race engines. (It has to do with the pistion spending more time at the top of the cylinder when the spark plug has just fired the fuel, and less connecting rod angle.) Advantages include a much lighter pistion than is possible with the stock length rod, giving it quicker accerlation and less reciprocating pistion weight. This DOES NOT change bore, stroke, engine displacement or compression ratio. The rod is longer and the piston is shorter but the final deck height is the same as "zero deck".
And heres a few other articles that explain some basic stuff:
torque and horsepower
Engine technolgy
05-18-2006, 03:39 AM
#20
6th Gear Member
Join Date: Sep 2005
Location:
Posts: 5,128
RE: Stroker
well my car has 112000 on it and from what i understand the early 4.6 V8s had problems with them going out as soon as 50-80k.... so it's not like my car is a piece of crap, just needs some repair... hauls a$$ tho