DOHC on 99+ GAGT

[traingeek087]

Ok I'll start off saying when it comes to engines i know the basics, that's it. - not too much. Quick question, is the 99+ GAGTs DOHC? The reason i ask this is because I see some Cutlass's that say DOHC that have the 3.4L engine, and if not wouldn't it be practical to put that in if your boosting your GA?

[Bjornboy81]

No it's not DOHC. It has one cam with OHV. There is a 3.4L DOHC as you mentioned, but it's a totally different engine. :)

As far as puting that in if you're boosting...how would it be more pratical to swap an enigne and boost as opposed to just boosting?

[traingeek087]

well isn't DOHC better than just a regular OHC (is OHC the same as SOCH) sorry for my lack on knowledge, but wouldn't DOHC have more horse power?

I read a thing that a GAGT has 175-180HP and the Cutlass has 210HP stock, so isn't that motor better?

[Matt95GT]

Originally posted by traingeek087
well isn't DOHC better than just a regular OHC (is OHC the same as SOCH) sorry for my lack on knowledge, but wouldn't DOHC have more horse power?


Yes. And OHC is often better than OHV pushrod in terms of stock output.

The 3400 is OHV pushrod... there is little to no possibilty of converting it to DOHC.

[Bjornboy81]

yes it is a better motor, but to swap a DOHC 3.4L and boost it would be rediculously expensive!

the 3400 in a GAGT I said is an over head valve (OHV) not an over head cam (OHC) configuration. :)

Here's a good read on the difference: http://en.wikipedia.org/wiki/Pushrod

[traingeek087]

hmm, i'm still a little confused, but what ur saying is DOHC wouldn't work in these type of engines....i'm asking this because i'm deciding if it's necessary to put all this aftermarket crap in for higher horsepower, or if it's just better to put a 3.8L GTP engine in. I've heard mixed opinions. (as i said my knowledge of engines is minimal, i'm all appearance, but my car will need to go faster.).

[MantaGreen97]

Originally posted by Bjornboy81
There is a 3.4L DOHC as you mentioned, but it's a totally different engine. :)


Well, the block is similar to the other 60 degree V6s, but yeah other than that it is totally different. Well actually the block was only based on the 60 degree pushrod engines; I guess the main similarity is the 60 degree angle which isn't much! :lol:

For interests sake, here's a link to info on the LQ1:
http://en.wikipedia.org/wiki/GM_60-Degree_V6_engine#LQ1

Originally posted by traingeek087
hmm, i'm still a little confused, but what ur saying is DOHC wouldn't work in these type of engines....


It's not a matter of double overhead cams "working" in these engines, these (the 3100/3400 60 degree engines and the 3800 90 degree engine) engines are OHV engines. It's like asking if an apple will "work" with an orange.

The LQ1 was based on the 60 degree OHV block (see the above link), but the block was adapted for DOHC duty--no cam in the block, obviously; modified oiling system; other changes.

Originally posted by traingeek087
i'm asking this because i'm deciding if it's necessary to put all this aftermarket crap in for higher horsepower, or if it's just better to put a 3.8L GTP engine in. I've heard mixed opinions. (as i said my knowledge of engines is minimal, i'm all appearance, but my car will need to go faster.).

I'm kind of confused that you're then talking about putting in aftermarket crap and then talking about an L67 swap. If you wanted to go with a DOHC engine you're still talking about an engine swap, not "aftermarket crap" :???:

Anyway, I'd imagine it would probably be easier to swap an LQ1 for an L82/LG8/LA1 engine than it would be to swap an L67 in. However the LQ1 is a lot harder to find; more expensive; and has less output (normally aspirated). The LQ1 is also arguably harder to work on and less reliable.

[Matt95GT]

Originally posted by traingeek087
hmm, i'm still a little confused, but what ur saying is DOHC wouldn't work in these type of engines...

No, unless you have the means to engineer and fabricate 2/3's of the engine. DOHC is not a mod... it's the design of the valvetrain on the engine which cannot be changed easily.

[NewNann]

Originally posted by MantaGreen97
Anyway, I'd imagine it would probably be easier to swap an LQ1 for an L82/LG8/LA1 engine than it would be to swap an L67 in. However the LQ1 is a lot harder to find; more expensive; and has less output (normally aspirated). The LQ1 is also arguably harder to work on and less reliable.

You took the words right out of my mouth on the last sentance.

3.4DOHC are WAY bigger than your average 3x00, theres a lot of moving things around, alt, rad, brake booster. It'll fit don't get me wrong, but is it worth the effort? There have been several succesful 3800SC swaps in L and Pre 94 J Bodies, and I've never seen a documented COMPLETED 3.4 swap in the same era car, as theres just not as much room as a W-body engine bay. Maybe there is in these cars, but for all the work you'd put into it, a 3800 would just make more sense. Since you have to make mounts etc. this motor already comes with FI, and there are a ton of NA ones out there to start with for those would go forged internals and a nice big turbo.

[coupe]

He is 17, he will be lucky to afford a CAI let alone doing any of these mods, i would be suprised if he could change his own oil.

[Matt95GT]

Originally posted by coupe
He is 17, he will be lucky to afford a CAI let alone doing any of these mods, i would be suprised if he could change his own oil.

Cool it. If nobody dared to dream and ask questions, nobody would have boost/engine swaps/etc. If it actually happens or not is a different story, but no need to speculate and/or belittle his financial situation/knowledge.

[traingeek087]

Originally posted by coupe
He is 17, he will be lucky to afford a CAI let alone doing any of these mods, i would be suprised if he could change his own oil.

So you wanna blab on about how much money i DON'T have huh? lol Yes, I am 17, but that doesn't mean that i don't have a well paying job. Do u think i'm going to swap a 3.8 this month? Hell no. When My current engine which has over 80,000 on it goes i will. and you think i can't find parts for a Grand Am cheap? lol - I know people in autobody and automotive, and if i really want it, when the time comes, I'll get it. Now, thanks to everyone who doesn't hijack the forums and is kind enough to answer my questions, and you have a nice day:) - and one more thing, why don't u post your age? :???2:

PS. by the way, I can change my own oil. :P

[coupe]

Im 24 and for some reason it wont show it.

[slowbird]

The DOHC is a better motor than the 3400 and 3800 motors.

The heads flow AMAZING!, and the ports were cast by god himself.

It's too large a mod to do to an N-body.

If anything....the best complicated Mod to produce the best gains: (More power, Reliablity, Fuel economy, fun etc) would be to swap a 5-speed into a Grand Am with a 3400.
Many 5-speeds will bolt to the 3400. You can tear apart the center console and put the shifter in and run the linkages.

Hard parts are custome tuning, Custom TRanny Mount, and Custom Drice Shafts.

and remember the GM Engine designations.

3.4L is not the same as a 3400. (3.4L DOHC or a 3400 OHV)
3.1L is not the same as a 3100.
The L67 is a supercharged 3800...not a 3.8L etc etc

[1992grandam]

Originally posted by coupe
He is 17, he will be lucky to afford a CAI let alone doing any of these mods, i would be suprised if he could change his own oil.

So what if hes 17? Im 19 and Im affording a $25k car.....With plenty of room to spare. If your motivated enough you can find a good paying job.

[Bjornboy81]

Originally posted by slowbird
3.4L is not the same as a 3400. (3.4L DOHC or a 3400 OHV)
3.1L is not the same as a 3100.
The L67 is a supercharged 3800...not a 3.8L etc etc huh? The 3400 OHV is a 3.4L motor....and the 3100 is 3.1L.

[1992grandam]

Originally posted by Bjornboy81
huh? The 3400 OHV is a 3.4L motor....and the 3100 is 3.1L.

What he means is that yes its 3.4L as in the size BUT the engine is not referred to it as a 3.4L, Its known as the 3400 and the 3.4L is commonly known as the DOHC 3.4. Same goes with the 3100. The 3.1L is a the older 3.1 L thats in GP's and other GM cars.

[Bjornboy81]

I refer to mine as a 3.4L :P

[1992grandam]

lol.... :D

[RocketFast321]

Originally posted by 1992grandam
What he means is that yes its 3.4L as in the size BUT the engine is not referred to it as a 3.4L, Its known as the 3400 and the 3.4L is commonly known as the DOHC 3.4. Same goes with the 3100. The 3.1L is a the older 3.1 L thats in GP's and other GM cars.

Also the 3.4 ohv that was in the fbody back in the 93era.

[TheTrader]

Originally posted by slowbird
and remember the GM Engine designations.

3.4L is not the same as a 3400. (3.4L DOHC or a 3400 OHV)
3.1L is not the same as a 3100.
The L67 is a supercharged 3800...not a 3.8L etc etc [/B]

Also, the 2200 is not the same as the 2.2lL Ecotec.....