4 -1 or 4-2-1 ?????
#1
Honda-Tech Member
Thread Starter
Join Date: Jun 2008
Location: los angeles, california, united states
Posts: 149
Likes: 0
Received 0 Likes
on
0 Posts
4 -1 or 4-2-1 ?????
So im rebuilding my single cam vtec motor from my 92 Si.
Motor is just about done and now looking to purchase some headers.
Looking to buy some DC headers and im not too familiar with the diffrence between 4-1 and 4-2-1 applications. Also whats the the diffrence between ceramic coated and stainless steel.
Can someone explain ??
Motor is just about done and now looking to purchase some headers.
Looking to buy some DC headers and im not too familiar with the diffrence between 4-1 and 4-2-1 applications. Also whats the the diffrence between ceramic coated and stainless steel.
Can someone explain ??
#3
The Grumpiest
iTrader: (4)
Join Date: May 2008
Location: Oak Ridge, TN, USA
Posts: 28,333
Likes: 0
Received 16 Likes
on
15 Posts
Re: 4 -1 or 4-2-1 ?????
Header. You only have one. And you might as well get something shiny off of eBay because you don't make any real gains that warrant spending that kind of money.
As for your second question. What's the difference? Are you kidding with this one?
As for your second question. What's the difference? Are you kidding with this one?
#4
Cool Cool Island Breezes. BOY-EE
iTrader: (1)
Join Date: Sep 2006
Location: TRILLINOIS....WAY downtown, jerky.
Posts: 11,953
Likes: 0
Received 4 Likes
on
4 Posts
Re: 4 -1 or 4-2-1 ?????
Ceramic coated steel is steel....coated in ceramic. Stainless steel is made from stainless steel.
The stainless steel is less prone to rust but needs special care while installing so it doesn't smudge or discolor improperly.
4-2-1 designs are better for low end that nobody cares about. Also better ground clearance.
4-1's typically make more power.
Don't waste $$ on a DC header unless you need CARB certification.
The stainless steel is less prone to rust but needs special care while installing so it doesn't smudge or discolor improperly.
4-2-1 designs are better for low end that nobody cares about. Also better ground clearance.
4-1's typically make more power.
Don't waste $$ on a DC header unless you need CARB certification.
#5
Honda-Tech Member
iTrader: (1)
Re: 4 -1 or 4-2-1 ?????
This is one of the rare times I disagree with something you say. I personally think that better low and mid would be better for daily driving the car, while the better top end of the 4-1would be better for someone who races their car. So really, lots of people should care about it...
#8
The Grumpiest
iTrader: (4)
Join Date: May 2008
Location: Oak Ridge, TN, USA
Posts: 28,333
Likes: 0
Received 16 Likes
on
15 Posts
Re: 4 -1 or 4-2-1 ?????
Negligible. With some type of CAI/SRI all you're doing is shifting the power band around. No real power.
The point I'm trying to make is that you get whatever fits your need but don't pay an arm and a leg for it and don't expect miracles.
The point I'm trying to make is that you get whatever fits your need but don't pay an arm and a leg for it and don't expect miracles.
#10
Cool Cool Island Breezes. BOY-EE
iTrader: (1)
Join Date: Sep 2006
Location: TRILLINOIS....WAY downtown, jerky.
Posts: 11,953
Likes: 0
Received 4 Likes
on
4 Posts
Re: 4 -1 or 4-2-1 ?????
This is one of the rare times I disagree with something you say. I personally think that better low and mid would be better for daily driving the car, while the better top end of the 4-1would be better for someone who races their car. So really, lots of people should care about it...
With a 4-2-1, youre still usually shifting the power upwards from stock anyway. Plus...if you're flooring it, you should only see the low end once...and you'll be in 1st.
But yes....you're right....for many reasons, a 4-2-1 is a good daily driver header. Ground clearance being a big factor.
There are 4-1's that add healthy midrange. Midrange is useful for all kinds of things. Making power from 3-5k RPM is more useful than 2-4k RPM. We're splitting hairs, though....
Neither one of the headers he's inquiring about is going to make earth shifting power. It's a gain or loss of 1-5hp in any given region and 1-3lb-ft in a given region with either.
#11
Re: 4 -1 or 4-2-1 ?????
#16
Re: 4 -1 or 4-2-1 ?????
So im rebuilding my single cam vtec motor from my 92 Si.
Motor is just about done and now looking to purchase some headers.
Looking to buy some DC headers and im not too familiar with the diffrence between 4-1 and 4-2-1 applications. Also whats the the diffrence between ceramic coated and stainless steel.
Can someone explain ??
Motor is just about done and now looking to purchase some headers.
Looking to buy some DC headers and im not too familiar with the diffrence between 4-1 and 4-2-1 applications. Also whats the the diffrence between ceramic coated and stainless steel.
Can someone explain ??
If I am correct 4-1 is mostly mid-top end and 4-2-1 is more low-mid range, I'm not 100% but that's what I believe is correct, get the 4-2-1 bro it tucks up higher so you get more ground clearance anyway, I used to have 4-1 but one smack and 1 engine mount later I made the switch, luckily the 4-1 was free lol
#17
Loves Tossing Salad
Join Date: Mar 2014
Location: They all look like little ants
Posts: 1,067
Likes: 0
Received 14 Likes
on
10 Posts
Re: 4 -1 or 4-2-1 ?????
Grumble is right....It all depends on what you're trying to do on your application. I was in it for the learning and spent the money for the stainless which is great. Do some research and all the aforementioned information is what you'll come across. Now that I'm starting to get well versed, you learn that it'll be at best something that makes your engine bay look nice.
#19
Man U FTW
Re: 4 -1 or 4-2-1 ?????
4-2-1 is better for midrange due to the exhaust scavenging effect of the runner pairing
4-1 is better for top end
If this is a street car, i'd get the 4-2-1 although it isn't going to make a huge difference either way
4-1 is better for top end
If this is a street car, i'd get the 4-2-1 although it isn't going to make a huge difference either way
Thread
Thread Starter
Forum
Replies
Last Post