Open engine opinion
Re: Open engine opinion
Both. Depending on the purpose of your build, its all about finding the right combination of BOTH to serve your purpose, whatever you will be using the engine for.
Thread Starter
Honda-Tech Member
Joined: Sep 2013
Posts: 41
Likes: 0
Well I'm planning to build an engine to push around 3-4oo . I just can't decide if I should go 10:1 na . Or go 9:1 with a longer crank stroke turbo .
Honda-Tech Member
Joined: Mar 2005
Posts: 2,428
Likes: 11
From: CT, US
Re: Open engine opinion
x2
longer stroke will increase tq a good amount, but the hp increase wont be as much as the tq increase, due to increased piston speeds. ideally, an engine should be square, which means: stroke = bore. Hondas typically use strokes that are bigger than bore. if you want displacement, it will depend on what the car will be used for. larger stroke will be better for low and mid range power, not so much higher rpm power (not always true, but is fairly typical). larger bore will give more displacement just the same, but will allow the extra power to still carry out all the way to redline, with no adverse side effects, especially if aftermarket pistons are used that typically weigh less than stock pistons, even though they're larger diameter.
longer stroke will increase tq a good amount, but the hp increase wont be as much as the tq increase, due to increased piston speeds. ideally, an engine should be square, which means: stroke = bore. Hondas typically use strokes that are bigger than bore. if you want displacement, it will depend on what the car will be used for. larger stroke will be better for low and mid range power, not so much higher rpm power (not always true, but is fairly typical). larger bore will give more displacement just the same, but will allow the extra power to still carry out all the way to redline, with no adverse side effects, especially if aftermarket pistons are used that typically weigh less than stock pistons, even though they're larger diameter.
Thread Starter
Honda-Tech Member
Joined: Sep 2013
Posts: 41
Likes: 0
x2 longer stroke will increase tq a good amount, but the hp increase wont be as much as the tq increase, due to increased piston speeds. ideally, an engine should be square, which means: stroke = bore. Hondas typically use strokes that are bigger than bore. if you want displacement, it will depend on what the car will be used for. larger stroke will be better for low and mid range power, not so much higher rpm power (not always true, but is fairly typical). larger bore will give more displacement just the same, but will allow the extra power to still carry out all the way to redline, with no adverse side effects, especially if aftermarket pistons are used that typically weigh less than stock pistons, even though they're larger diameter.
Trending Topics
Honda-Tech Member
Joined: Feb 2013
Posts: 124
Likes: 0
From: oceanside ca.
Before you get your piston take the time to get all the measurements such as deck hieght and chamber CCs to insure the correct comp ratio you desire. One benifit of running the bigger bore (depending on bore size) is you can do some chamber work that will not only help with radius deburring and low lift flow numbers that with a good set of cams can be one hell of a street car with a well balanced power band.
Thread Starter
Honda-Tech Member
Joined: Sep 2013
Posts: 41
Likes: 0
Before you get your piston take the time to get all the measurements such as deck hieght and chamber CCs to insure the correct comp ratio you desire. One benifit of running the bigger bore (depending on bore size) is you can do some chamber work that will not only help with radius deburring and low lift flow numbers that with a good set of cams can be one hell of a street car with a well balanced power band.
Thread
Thread Starter
Forum
Replies
Last Post