so ive just gotten my license (and a 93 accord lx) and i was wondering what were the pros and cons of sohc motors vs dohc motors, besides the blatent hp difference between the F22 and the H22. also, how reliable are boosted F22 engines? thanks.

 

GOD this is getting retarded. Please make use of the SEARCH BUTTON This topic gets covered all of the time and because noone will search. Yes the H22 is better if you are a daily driver but no it is not always better than a f22 turbo. Just search and you will find all of the answers you need!

 

(sigh) i did in fact make much use out of the search button. i jsut wasnt able to find any technical advice on it. for instance i know that the F22 is cheaper and that the piston rings will go on 17psi of boost, and that the H22 comes 200hp stock out of a prelude or a jdm accord. and many other goodies like F22 axles paired wiht H22 trannies and vice versa. my question is about sohc and dohc motors in general and then how it pertains to performance of the F22 and H22.

anyone with helpful advice?

 

probably depends on your end use, or what you are looking to get out of the vehicle and performance--all motor or a boosted set-up--mileage on one either of these may affect it as well.

 

If your going 17psi on a stock f22 its time for ya. And even if you did use the search button its been covered MANY times plus try and use the .

 

Ok smart *** here is your answer. Using the same budget a person would be better off going with either an h22 swap if they want NA or an F22 turbo if they want FI. The F22 will not hold up to 17 pounds and if you think the rings are the only thing that you have to worry about holding then you don't know as much as you think. In general the DOHC motors are known for having higher redlines and more noticeable vtec engagement points. The SOHC f series motors are known for lots of torque when boosted, and a lower redline with a less prominent vtec engagement point. Oh and since you just got your license i would suggest you not worry about modding your car just yet and focus on learning to drive and the proper ways to handle a car before you start adding to your car's potential.

 

what allows dohc motors to have higher redlines? <TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01accordv6 &raquo;</TD></TR><TR><TD CLASS="quote">Ok smart *** here is your answer. Using the same budget a person would be better off going with either an h22 swap if they want NA or an F22 turbo if they want FI. The F22 will not hold up to 17 pounds and if you think the rings are the only thing that you have to worry about holding then you don't know as much as you think. In general the DOHC motors are known for having higher redlines and more noticeable vtec engagement points. The SOHC f series motors are known for lots of torque when boosted, and a lower redline with a less prominent vtec engagement point. Oh and since you just got your license i would suggest you not worry about modding your car just yet and focus on learning to drive and the proper ways to handle a car before you start adding to your car's potential.</TD></TR></TABLE>
well you gotta start learning somewhere.

as for the 17psi bit https://honda-tech.com/zerothread?id=768371. keep scrolling down. just saying what i read.

 

The stock internals of an F series will not hold 17 psi accord freak is running 14 i believe but that is about the limit. In my previous post i said that the DOHC motor are known for higher redlines one reason is that the stroke is not as long and the bore is bigger which allows for a higher redline. Just having a DOHC motor does not automatically mean it will be better, they do have advantages in that you can adjust the exhaust and the intake cams independently of each other for better tuning. The DOHC motors transmissions usually have shorter gears which allow the motor to stay in the high rpms after shifts where the SOHC trannys have longer gears which some say is better for boost. And i really hope your learning comment was not directed towards me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01accordv6 &raquo;</TD></TR><TR><TD CLASS="quote">The stock internals of an F series will not hold 17 psi accord freak is running 14 i believe but that is about the limit. In my previous post i said that the DOHC motor are known for higher redlines one reason is that the stroke is not as long and the bore is bigger which allows for a higher redline. Just having a DOHC motor does not automatically mean it will be better, they do have advantages in that you can adjust the exhaust and the intake cams independently of each other for better tuning. The DOHC motors transmissions usually have shorter gears which allow the motor to stay in the high rpms after shifts where the SOHC trannys have longer gears which some say is better for boost. And i really hope your learning comment was not directed towards me.</TD></TR></TABLE>

dohc sohc its all advertising BS. tit for tat a sohc cam with identical head flow and the same cam profile as a dohc engine will make mroe power beucase it has less rotating mass and less frition. There one to wrap around your head for a while.

build whatever you fancy. I play with iron block sohc 12v engine in 3g accord and i have no trouble spanking domestic and import cars. although i would lean heavily to sticking with to sticking with your cars native engine $$ being a large issue. just do whateever you think works best for you.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01accordv6 &raquo;</TD></TR><TR><TD CLASS="quote"> And i really hope your learning comment was not directed towards me.</TD></TR></TABLE>
huh? i was using the collective you. i guess i shoulda said, "one has to start learning somewhere". anyway etymological issues aside, thanks for your input.

 

So you think the ITR the ATR and the CTR and all recent Ferrari's have DOHC motors in them and that most performance cars have twin cams is a marketing gimmick. Explain that for me cause i am at a loss as to why they would spend all of that money just to put an extra cam per cylinder bank if it does nothing. Hmmm let me think.

 

the engineer's motto, "if it aint broke..
...fix it until it is."

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by daived &raquo;</TD></TR><TR><TD CLASS="quote">so ive just gotten my license (and a 93 accord lx) and i was wondering what were the pros and cons of sohc motors vs dohc motors, besides the blatent hp difference between the F22 and the H22. also, how reliable are boosted F22 engines? thanks.</TD></TR></TABLE>

i'm surprised this hasn't been said yet, but learn how to drive first before you make your car fast. just cause you got your license doesn't mean you can drive well.

 

i like this kid, he knows more about cars and engines than i did when i first got my car at 16...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01accordv6 &raquo;</TD></TR><TR><TD CLASS="quote">i said that the DOHC motor are known for higher redlines one reason is that the stroke is not as long and the bore is bigger which allows for a higher redline. </TD></TR></TABLE>

what???? DOHC is just a label for the twin cam head...it has nothing to do with the size or length of the bore and stroke...the head and block are two very different things...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01accordv6 &raquo;</TD></TR><TR><TD CLASS="quote"> The DOHC motors transmissions usually have shorter gears which allow the motor to stay in the high rpms after shifts where the SOHC trannys have longer gears which some say is better for boost. </TD></TR></TABLE>

since when do sohc motors and dohc motors have any kind of relativity towards the gear ratios...they don't...the only reason that they would have any kind of influence over gear ratios is because of power delivery...sohc motors do not make power at the top of their rpm range, generally...now there are always exceptions to this rule, and i realize there is an sohc civic running around on this board fully built all motor with like 180ish hp to the wheels...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01accordv6 &raquo;</TD></TR><TR><TD CLASS="quote">So you think the ITR the ATR and the CTR and all recent Ferrari's have DOHC motors in them and that most performance cars have twin cams is a marketing gimmick. Explain that for me cause i am at a loss as to why they would spend all of that money just to put an extra cam per cylinder bank if it does nothing. Hmmm let me think.</TD></TR></TABLE>

one reason for this extra cam is due to the fact that sohc motors can't usually fit a variable cam lobe for both intake and exhaust...notice all honda sohc motors just have vtec on the intake cam only...this is because one cam does not have the room to fit 6 different lobes per cylinder and do it efficiently and reliably...the cam would have so much tension and stress that it would eventually break...so one logical solution is just to use the extra cam...

another reason, you are right, is to be able to tune the cams differently for intake and exhaust...a dohc motor will generally be able to breathe easier at higher rpms because of an advanced and more efficient flow design...

 

Well said. I believe the solved that problem.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nick H &raquo;</TD></TR><TR><TD CLASS="quote">i like this kid, he knows more about cars and engines than i did when i first got my car at 16...</TD></TR></TABLE>

...to me he just sounds like a smart noob who found out how to use the search button before we all told him to. he gets a for that


DOHC valve trains are lighter and allow for high rpms that's the main reason for it, it doesn't have much to do with VTEC except that they can both work together to make a great N/A motor in the case of a honda. DOHC motors have been around for a long time, the mitsu 4G63 is a DOHC motor and that's been around since like '89. the great SR20 motor nissan makes is a DOHC also. hell even the shitty dodge motor used in the non-turbo eclipse and the higher end neons is a DOHC motor.

 

Jesus dude did you have to be that rude about it. Discussing H22 vs F22 then talking about the blocks is a must and talking about the transmissions is equally as important. You answered your own question about gear ratios because of the power band. I was describing the general differences between an dohc and a sohc motor and the respective setups i.e. transmission and block build. Those things are important when discussing two different motors and which is better. In short, i was not only discussing the head but i was discussing the many things that make up the differences between the two.

 

DOHC motors would not have a lighter valve train because they have twice the metal so there would be more rotational mass.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01accordv6 &raquo;</TD></TR><TR><TD CLASS="quote"> In short, i was not only discussing the head but i was discussing the many things that make up the differences between the two.</TD></TR></TABLE>

the head is the only place that has two cams...the block has nothing to do with a dohc head...you can outfit a dohc head to any block you want...

 

ok keep going i am learning. **** i got all the information here. lol i don't need the search botton. lol joke

 

I understand that the only difference between them is the head but I was not just talking about any dohc motor vs any sohc motor. I was talking about the sohc f series and the dohc h series and the pros and cons of both because i am sure that he is wondering if he should swap or not. I am not trying to argue that a Dohc motor's bottom end has anything to do with the type of head that is put on. I was trying to give him a better understanding of the differences between the two.

 

alright thanks for clearing that up...i was under the impression that you were merely stating that all sohc motors and all dohc motors were a certain way...

 

I am glad we are on the same page now. Back to topic MY best advice for him as i stated before was to learn to drive safely and under control before he starts thinking of swap or turbo because that is alot of power for someone that does not have a lot of driving experience.

 

thanks for the information. what about fuel injection systems? i was looking at my engine with my auto friend and he wasnt quite sure what kind of fuel injection my f22a has.