Engine builders opinions 4.250 stroke vs. 4.00 stroke
#1
TECH Regular
Thread Starter
iTrader: (3)
Join Date: Jun 2004
Location: alexandria, La
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
Engine builders opinions 4.250 stroke vs. 4.00 stroke
How much more torque will this 4.250 stroke make over a 4.00 inch stroke with a big 4.185 or 4.200,heads & intake, cam, the same. Please give your experiences and advice.
#3
FormerVendor
Originally Posted by texada
How much more torque will this 4.250 stroke make over a 4.00 inch stroke with a big 4.185 or 4.200,heads & intake, cam, the same. Please give your experiences and advice.
Power on the other hand is mostly airflow and fuel dependent so the new larger engine may or may not be more powerful.
The bigger stroke engine will make the same or more power but at a lower rpm but if you want even more power you can further improve the heads and/or run even a larger cam in the newer larger stroke engine for even more power.
Saying all that though you can't just put a 4.250 stroke in any engine without making other compromises but it will go into a sleeved engine with longer sleeves and a shorter piston if all is designed right.
#4
10 Second Club
iTrader: (5)
Join Date: Jul 2005
Location: by my computer
Posts: 2,958
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by racer7088
Torque is displacement dependent so you will get basically the same per cent more TQ as you are stroking it.
Power on the other hand is mostly airflow and fuel dependent so the new larger engine may or may not be more powerful.
The bigger stroke engine will make the same or more power but at a lower rpm but if you want even more power you can further improve the heads and/or run even a larger cam in the newer larger stroke engine for even more power.
Saying all that though you can't just put a 4.250 stroke in any engine without making other compromises but it will go into a sleeved engine with longer sleeves and a shorter piston if all is designed right.
Power on the other hand is mostly airflow and fuel dependent so the new larger engine may or may not be more powerful.
The bigger stroke engine will make the same or more power but at a lower rpm but if you want even more power you can further improve the heads and/or run even a larger cam in the newer larger stroke engine for even more power.
Saying all that though you can't just put a 4.250 stroke in any engine without making other compromises but it will go into a sleeved engine with longer sleeves and a shorter piston if all is designed right.
#5
TECH Veteran
iTrader: (21)
Originally Posted by Forteen3GT
what are your thought if you change the argument to 4.1 vs. 4.0 cranks????
#6
FormerVendor
Originally Posted by Forteen3GT
what are your thought if you change the argument to 4.1 vs. 4.0 cranks????
#7
LS1TECH Sponsor
iTrader: (10)
Originally Posted by Beast96Z
Basically the same answer, accept you can run a 4.100" on a stock sleeve. It wouldn't leave the "optimal" ring pack, but it can be done. Having a good piston design will help in the longevity of the motor if you decide to do it with a stock legnth sleeve. Like I said earlier, power will be relivant to heads/intake being utilized.
Trending Topics
#9
FormerVendor
It also depends on if you want something to take a 250 shot or if it's NA with maybe only a small NOS shot every once in a while.
NOS destroys everything basically so parts have to be made way more stout or they fail very quickly if anything goes wrong.
NOS destroys everything basically so parts have to be made way more stout or they fail very quickly if anything goes wrong.
#12
10 Second Club
iTrader: (5)
Join Date: Jul 2005
Location: by my computer
Posts: 2,958
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by racer7088
It also depends on if you want something to take a 250 shot or if it's NA with maybe only a small NOS shot every once in a while.
NOS destroys everything basically so parts have to be made way more stout or they fail very quickly if anything goes wrong.
NOS destroys everything basically so parts have to be made way more stout or they fail very quickly if anything goes wrong.
at minimum I am looking to run a 200 shot thru a 90mm TB/Intake plate kit. I will go thru about 1 bottle every couple of weeks or less. Just enough for 2 times at the track a month and 1 or 2 trips down the street for money races. Curious if those 4.1 pistons can hold up to this kind of nitrous. If not I will likely just stick with a 408 vs 418.
Erik, Let me know if ya had a chance to look at that 346 sittin bagged on the floor.
#13
TECH Regular
Thread Starter
iTrader: (3)
Join Date: Jun 2004
Location: alexandria, La
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Forteen3GT
at minimum I am looking to run a 200 shot thru a 90mm TB/Intake plate kit. I will go thru about 1 bottle every couple of weeks or less. Just enough for 2 times at the track a month and 1 or 2 trips down the street for money races. Curious if those 4.1 pistons can hold up to this kind of nitrous. If not I will likely just stick with a 408 vs 418.
Erik, Let me know if ya had a chance to look at that 346 sittin bagged on the floor.
Erik, Let me know if ya had a chance to look at that 346 sittin bagged on the floor.
#14
TECH Veteran
iTrader: (21)
Originally Posted by RyneZ06
he didnt ask you
Originally Posted by racer7088
Beast knows his stuff too!
Originally Posted by RyneZ06
just like to give him crap
Originally Posted by Forteen3GT
just like to give him crap and troll his threads, as well as argue and ruin sponsors threads like the Livernois thread
Originally Posted by Forteen3GT
at minimum I am looking to run a 200 shot thru a 90mm TB/Intake plate kit. I will go thru about 1 bottle every couple of weeks or less. Just enough for 2 times at the track a month and 1 or 2 trips down the street for money races. Curious if those 4.1 pistons can hold up to this kind of nitrous. If not I will likely just stick with a 408 vs 418.
Originally Posted by texada
Last edited by Beast96Z; 01-22-2007 at 11:20 PM.
#15
TECH Fanatic
iTrader: (1)
Join Date: Oct 2002
Location: Elmhurst, IL (Chicago Suburb)
Posts: 1,851
Likes: 0
Received 0 Likes
on
0 Posts
I know many top engine builders who prefer a 4.00 stroke in a LS series racing type motor (especially over 4.250 monster stroke) especially on a motor that will be seeing rpms up to 7500, as their is less oil usage issues, faster revving=better racing motor, better engine geometry and longevity, etc., etc. There is a reason why the GM race Cars (C5R and C6Rs) use no bigger than 4 inch stroke!! I have also had an top engine builder that built me a 427 iron motor utilizing a 4.125 Callies crank on a 4.060 overbore and that Crank failed big time (reluctor wheel broke and crank welds) and i don't think I will run larger than a 4.00 stroke in the 454 LSX motor that I will plan on building this year, after that wonderful experience!! That old iron 427 motor of mine also used oil like a sive
Last edited by MTI 427 C5 Roadster; 01-23-2007 at 12:16 AM.
#16
TECH Veteran
iTrader: (21)
Originally Posted by MTI 427 C5 Roadster
I have also had an top engine builder that built me a 427 iron motor utilizing a 4.125 Callies crank on a 4.060 overbore and that Crank failed big time (reluctor wheel broke and crank welds) and i don't think I will run larger than a 4.00 stroke in the 454 LSX motor that I will plan on building this year, after that wonderful experience!! That old iron 427 motor of mine also used oil like a sive
Erik was great in working with Wiesco on getting me a piston that would be very reliable in the long run for my 4.185" stroke 454. Ring spacing and skirt shape were some of the major things they worked on. After talking alot with Erik and some with Brian@ wiesco, I can't foresee this being a problem motor, but only time will tell.
#17
FormerVendor
Unfortunately most of the people building the big stroke motors hardly know/knew what they are/were doing and that's why there's as many problems as there are/were.
I have seen no real problems with the bigger cranks when done right.
I have seen no real problems with the bigger cranks when done right.
#18
10 Second Club
iTrader: (5)
Join Date: Jul 2005
Location: by my computer
Posts: 2,958
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by racer7088
Unfortunately most of the people building the big stroke motors hardly know/knew what they are/were doing and that's why there's as many problems as there are/were.
I have seen no real problems with the bigger cranks when done right.
I have seen no real problems with the bigger cranks when done right.
It is not worth sacrificing over 100 horses for the additional 10-15 you gain NA.
#19
FormerVendor
It's getting close so I would stay with the 4.000 if you're focusing on NOS.
Originally Posted by Forteen3GT
well..... if the 4.1 means no 200 shot, then I personally will stick with the 4.0 crank.
It is not worth sacrificing over 100 horses for the additional 10-15 you gain NA.
It is not worth sacrificing over 100 horses for the additional 10-15 you gain NA.
#20
On The Tree
Join Date: Apr 2004
Location: Brampton, Ontario
Posts: 157
Likes: 0
Received 0 Likes
on
0 Posts
Stay away form anything larger than a 4.0 stroke.
My Callies Crank in my 447ci had major reluctor wheel issues after only 2000 miles and motor had to be taken apart.
My Callies Crank in my 447ci had major reluctor wheel issues after only 2000 miles and motor had to be taken apart.