v-tec lobes only on intake cams?
02-25-2007, 10:06 PM
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v-tec lobes only on intake cams?
noob question im sure.
i have a 02 civic si. thats a k20a3 right? its says no where on the engine, that i know of. is this the engine with v-tech on intake side only? its pretty god damn slugish!
why is the gearing so short, 80mph at 4grand.
6 speed swap woth it? i mean this thing is seems terrible on highways
it has 100,000 miles on it.
do these cars really have any potential? without a rebuild or too anything major? I know shes a fat girl
i have a 02 civic si. thats a k20a3 right? its says no where on the engine, that i know of. is this the engine with v-tech on intake side only? its pretty god damn slugish!
why is the gearing so short, 80mph at 4grand.
6 speed swap woth it? i mean this thing is seems terrible on highways
it has 100,000 miles on it.
do these cars really have any potential? without a rebuild or too anything major? I know shes a fat girl
02-25-2007, 11:52 PM
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Re: v-tec lobes only on intake cams? (ktwanky)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ktwanky »</TD></TR><TR><TD CLASS="quote">noob question im sure.
i have a 02 civic si. thats a k20a3 right? its says no where on the engine, that i know of. is this the engine with v-tech on intake side only? its pretty god damn slugish!
why is the gearing so short, 80mph at 4grand.
6 speed swap woth it? i mean this thing is seems terrible on highways
it has 100,000 miles on it.
do these cars really have any potential? without a rebuild or too anything major? I know shes a fat girl </TD></TR></TABLE>
yes, its a k20a3!
no, it has i-vtec on both exhaust and and intake plus the ecu controls the timing on the cams!
your car is only 160 horses man.if its sluggish try checking your oil level, the ecu will delay the vtec if its low on oil to prevent engine damage and make sure you put 5w20 when you do oil changes!!!
the gear ratios are short for faster take offs,this is normal! thats why your rpm gauge redlines about 8.the damn thing was built to rev a little higher than normal engines.let me guess, your first honda?
6speed swap? ratios might be a little longer but for the most part same ****** ****.
just more hp i suggest rsx type s 200 hp or type r 220 hp.
oh yah, before i forget. next time you ask a question on honda-tech do some research FIRST!!!!!
i have a 02 civic si. thats a k20a3 right? its says no where on the engine, that i know of. is this the engine with v-tech on intake side only? its pretty god damn slugish!
why is the gearing so short, 80mph at 4grand.
6 speed swap woth it? i mean this thing is seems terrible on highways
it has 100,000 miles on it.
do these cars really have any potential? without a rebuild or too anything major? I know shes a fat girl
</TD></TR></TABLE>yes, its a k20a3!
no, it has i-vtec on both exhaust and and intake plus the ecu controls the timing on the cams!
your car is only 160 horses man.if its sluggish try checking your oil level, the ecu will delay the vtec if its low on oil to prevent engine damage and make sure you put 5w20 when you do oil changes!!!
the gear ratios are short for faster take offs,this is normal! thats why your rpm gauge redlines about 8.the damn thing was built to rev a little higher than normal engines.let me guess, your first honda?
6speed swap? ratios might be a little longer but for the most part same ****** ****.
just more hp i suggest rsx type s 200 hp or type r 220 hp.
oh yah, before i forget. next time you ask a question on honda-tech do some research FIRST!!!!!
02-26-2007, 09:08 AM
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Re: v-tec lobes only on intake cams? (H-adict)
Fourth Honda, first k-series, and im not impressed. maybe the engine is just tired, the b16a's seem much stronger and half the price.
expletive it im about to just by a rotary
expletive it im about to just by a rotary
02-26-2007, 09:25 AM
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Re: v-tec lobes only on intake cams? (ktwanky)
i knew i had read this some where in a mag, but i found it online for you all as well.
@ http://www.sportcompactcarweb...._head/
This is the VTEC you're used to. The second system, found on the K24 (Element, CR-V, Accord) and the K20A3 (base RSX and Civic Si), is designed to minimize emissions and maximize driveability and gas mileage. In this system, there are two cam lobes, a normal one and a puny little atrophied one, for each pair of intake valves (nothing happens on the exhaust side). At light load and low rpm, each lobe opens one valve, so most of the intake air goes through the valve that's opened more. This creates a swirl in the combustion chamber that happens to be great for combustion efficiency. Floor it, though, and one valve won't be enough, so both valves follow the bigger lobe. Notice there's no screaming high-rpm race lobe here.
And this from http://www.superhonda.com
@ http://www.sportcompactcarweb...._head/
This is the VTEC you're used to. The second system, found on the K24 (Element, CR-V, Accord) and the K20A3 (base RSX and Civic Si), is designed to minimize emissions and maximize driveability and gas mileage. In this system, there are two cam lobes, a normal one and a puny little atrophied one, for each pair of intake valves (nothing happens on the exhaust side). At light load and low rpm, each lobe opens one valve, so most of the intake air goes through the valve that's opened more. This creates a swirl in the combustion chamber that happens to be great for combustion efficiency. Floor it, though, and one valve won't be enough, so both valves follow the bigger lobe. Notice there's no screaming high-rpm race lobe here.
And this from http://www.superhonda.com
02-26-2007, 10:32 AM
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Search.
In brief,
They'll gain about 20+ whp with a decent i/h/e combo, even without Hondata.
They'll run all day at 4K rpm with no problem (won't change much with a 6-speed; those ratios are closer together, and the top gear isn't much taller, if at all, depending on the year of the donor car). Don't bother with an RSX Type-S or DC5-R 6-speed unless you either: A) raise the redline beyond 7500 RPM, or B) won't get tired of shifting all the damn time.
There ARE ways to run cams for the A2, and there ARE aftermarket cams for the A3. You can also build it like any other motor. Some of the guys building for super-high revs will go for an A3 block partly because of its lack of oil squirters (they want to keep rotating masses down, and oil being squirted on the pistons makes them heavier).
The A3 takes boost well enough, too. You'll be able to surpass 220 whp with a JRSC race kit, and 300 whp with turbo isn't uncommon. All on the stock block, and really, you don't need more than that on a street- or circuit-driven front-drive car.
One other common rookie complaint about K-series motors is that, even on the "true VTEC" Type-S and TSX motors, you "can't feel the VTEC hit like in the B-series engines." That's because every K motor has much better fuel management and -- even on the A3s -- the ability to alter the timing & overlap of the cams. The result is that the engine will make more power, more often, and under more load conditions.
Now... Welcome back to the real world, where people actually work on their K20A3's rather than just dismiss them in a magazine article paragraph. You can have plenty of fun with the A3, or you can swap without much effort, too. Do some good suspension work, get some good tires, and get some racing instruction (if you haven't already) when you're ready to rock.
In brief,
They'll gain about 20+ whp with a decent i/h/e combo, even without Hondata.
They'll run all day at 4K rpm with no problem (won't change much with a 6-speed; those ratios are closer together, and the top gear isn't much taller, if at all, depending on the year of the donor car). Don't bother with an RSX Type-S or DC5-R 6-speed unless you either: A) raise the redline beyond 7500 RPM, or B) won't get tired of shifting all the damn time.
There ARE ways to run cams for the A2, and there ARE aftermarket cams for the A3. You can also build it like any other motor. Some of the guys building for super-high revs will go for an A3 block partly because of its lack of oil squirters (they want to keep rotating masses down, and oil being squirted on the pistons makes them heavier).
The A3 takes boost well enough, too. You'll be able to surpass 220 whp with a JRSC race kit, and 300 whp with turbo isn't uncommon. All on the stock block, and really, you don't need more than that on a street- or circuit-driven front-drive car.
One other common rookie complaint about K-series motors is that, even on the "true VTEC" Type-S and TSX motors, you "can't feel the VTEC hit like in the B-series engines." That's because every K motor has much better fuel management and -- even on the A3s -- the ability to alter the timing & overlap of the cams. The result is that the engine will make more power, more often, and under more load conditions.
Now... Welcome back to the real world, where people actually work on their K20A3's rather than just dismiss them in a magazine article paragraph. You can have plenty of fun with the A3, or you can swap without much effort, too. Do some good suspension work, get some good tires, and get some racing instruction (if you haven't already) when you're ready to rock.
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02-26-2007, 08:00 PM
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This one needed a hint. I knew that the phrase "lost motion assemblies" appeared in this thread and hardly any others ever, especially in the DC5/EP3 section.
https://honda-tech.com/zerothread?id=1543803
Another hint: Don't forget to check for archived content by clicking the radio button on the right half of the search page. Threads get separated into an archived section pretty quickly after inactivity (two weeks, maybe), which makes people repeat questions more often.
https://honda-tech.com/zerothread?id=1543803
Another hint: Don't forget to check for archived content by clicking the radio button on the right half of the search page. Threads get separated into an archived section pretty quickly after inactivity (two weeks, maybe), which makes people repeat questions more often.
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