ok i have a 2002 cavy with a 2.2L ohv ... i was wondering what parts would give me more mid-high range power?

a simple
intake
with header
hi flow cat with full exhaust

will help alot

A better choice of cam... with more lift & duration... would be a considerable improvement over stock, since the stock cam was designed more with mileage in mind. And better ports on the heads. Many here feel that the breaking-point for the LN2 is the failure in designing it with better flowing ports on both sides of the breathing (Intake & exhaust) in both trims it came in (pre-'98 & post-'97), so a good porting job with caution taken to avoid removing too much material from critical surfaces with coolant or hot oil on the other side. Maybe you'd feel safer getting a Patriot Level-1 head when it comes to that area... They're expensive (What performance-related for the LN2 isn't?) but worth it as a direct bolt-on.


Go beyond the "bolt-on".

-A header back 2 1/4" exhaust, including high flow cat.
-Intake, 2.3L Quad-4 throttle body (56mm as opposed to stock 52mm).
-Ported and Polished head with +1mm valves.
-Reground camshaft with approximately 198*-204* intake duration @ 0.050", and approximately 6*-10* more exhaust duration and max lift @ the valve (i.e. including rocker arm ratio) of no more than 0.470". (You can do more lift, if you do your research, the info is on here.)
-Zero deck the block and use a head gasket of 0.035"-0.045" thickness (Cometic). (Should yield close to 10:1 compression ratio.)
-Tuning with HPT.

The 2200 OHV is a short rod-to-stroke ratio motor, with two valves per cylinder and the cam center-lines are fairly wide. This all contributes to a motor that will build brutal low to mid range torque. In fact more it is more conducive to low to mid range torque than the other GM 4cyl motor designs.

not thread jacking.
MadJack- is there any improvement with the 2.3 TB on a stock 2200?

MadJack wrote:

The 2200 OHV is a short rod-to-stroke ratio motor, with two valves per cylinder and the cam center-lines are fairly wide. This all contributes to a motor that will build brutal low to mid range torque. In fact more it is more conducive to low to mid range torque than the other GM 4cyl motor designs.

True... Just look at the Iron-Duke compared to the Double-Deuce (LN2). Theory was that to get a small engine to perform at levels found to satisfactory to drivers used to the performance of larger engines, the old rule of RPM in relation to HP-peak needed to come into play (Higher revs + More HP!). The best way to really do that, and maintian a broad torque-curve, was to build the engine with a relatively long rod & short stroke, while giving it a huge bore (Say 4" bore x 3" stroke?). But for mileage sake, going the other way is best as few RPMs are needed to produce the same level of torque, which now peaks lower. And the lower in the engine's RPM operating range is, the fewer revs needed to be turned by the engine... which effects fuel consumption. Dare I say it (Yeah... I will!), it's the best design of 2-valve engine meant for economy that uses a "outdated" valve-actuation design I've ever seen. It's like an old gasoline school-bus engine: Revs low... And moves mountains.

And no, just installing a larger TB on a all-stock engine won't improve anything. The area of the TB effects how much total air is allowed to enter your engine. If your engine hasn't been modified in some way to breathe more air (Bigger everything!) it won't need it.


Go beyond the "bolt-on".

how about the bigger throttle body for nitrous? would that show any gains? i have msd ignition ,stock header, magnaflow exhaust, iridium plugs and plan on a 55 shot of nitrous.

Uh... Jack?


Go beyond the "bolt-on".

The throttle body will help with that setup when using the 55 shot letting it breath better. But will kill some of your down low tourqe. But with supporting mods your grunt down low should be about the same if not a lil more than stock. Though on a stock motor you probably won't like it.

Nate if i was you before you shot a 55shot. Go with A header, and 2 1/2 in exhuast all the way back to the magnaflow with a high flow cat if you need one. A cold air intake ( ebay will work pipe is pipe but get a good filter). Do a full tune up( wires, plugs( go a 1/2 step on 1 step colder), fuel filter, check coils out if using stock, compression check the motor, Do a coolant system flush( making sure the coolant system is up to par for the 55shot) and check fuel pressure. Before i even though of hitting it with a 55 shot.

But get a header,cai, and full exhuast. And let it breath, you'll be glad you did...

i have a pipe with a aem filter on it . i have msd coils. i have msd 8mm streetfire wires , which plugs (maybe a part number?) should i go with? i have bosch platinum 2's,i have the stock pipe back to no muffler just a magnaflow tip. how much do you think it would cost to get a header back pipe bent? with a spot to relocate the o2 sensor and delete the cat. how do i check compresion? never messed with anything internal yet. i plan on getting a header probably obx 4-1 . fuel filter will get replaced also(thanks i didnt think about that...) coolantflushed a few weeks ago... DOES ANYONE HAVE AN EXTRA 2200 HEAD AND WOULD SHIP TO INDIANA? i want to port and polish ahead this winter