4AGE camshaft discussion... Your help is needed

**qcautosports** · 14-05-2008, 06:21 AM

Depending on the availability, I'd go for the 272/272 or 288/272 TRD cams with 10.5 lift since you're considering using aftermarket buckets. The 7.5 lift TRDs will probably not give you what you want as for torque. And there is really no way it will pass smog.

Time the cam to specs and I'm pretty sure you'll be happy with it.

**Starfire** · 14-05-2008, 10:41 AM

You could always front up to the emissions test with standard smallport cams and a conservative tune. It wuld only take a couple of hours to swap over.

**oldeskewltoy** · 15-05-2008, 02:02 AM

Starfire - You make a VERY good point.... Now for the but....... I'd like to think of myself as a "green" person... keeping my carbon footprint to a minimum. The management system will have sequential injection, and a wasted spark type ignition system. All of this is to run as clean as I can, and to hopefully achieve a respectable mpg as well........

Yes, I'm looking to, "have my cake and eat it too". I want as much n/a power as I can AND still pass emissions and burn a minimal amount of fuel.

I've spoken to Web Camshafts... and I've spent about an hour discussing this subject with Loynings techs........

They have a different idea........ I'll have a "test" set of cams to fit this engine, dyno runs will be made and once the "test" set has dyno time, they'll (Web and Loyning) look at HP and torque, and adjust on the test set accordingly. Once the power is analyzed/optimized, then and only then will I know what cams I'm running....

For this part of the set up... I'll be using the stock lifter/shim combination.(this is a hint... no lifts over 9mm, no radical duration) Once the cams are set, and known, then I'll source some SZ lifters to lighten the valve train further

**Starfire** · 15-05-2008, 02:18 AM

A rather lofty goal indeed. Have you investigated running it on LPG? That can be quite clean burning, especially if you went for a liquid injection setup. As a plus its cheaper to run and over 100RON.

In Australia there are governent rebates for LPG conversions too - I don't know if the US has anything like that in place though.

Even if you do go for a fairly worked petrol 4AG, they are reasonably clean engines and it will certainly be better than anything worn out and carbie fed, not to mention most of those old 'yank tanks' getting around with big block V8s

Cheers,
Terry

**GTI-TRD** · 15-05-2008, 10:26 AM

Originally Posted by turbo4agte

Im pretty sure you're not going to pass emissions if you put cams on a 4AGE with 10.7:1 compression.

A stock smallport has 10.6:1 compression ratio standard. Do these not pass yuor emissions laws? cant imagine .1 increase is going to nudge it over the legal limit.
However the extra lift cams could quite likely do that

**oldeskewltoy** · 15-05-2008, 11:08 AM

Originally Posted by GTI-TRD

A stock smallport has 10.6:1 compression ratio standard. Do these not pass yuor emissions laws? cant imagine .1 increase is going to nudge it over the legal limit.
However the extra lift cams could quite likely do that

stock smallport is 10.3 to 1.

Small port cams are extremely whimpy about 7.4mm lift

**amichie** · 15-05-2008, 11:32 AM

Get atleast one adjustable cam gear. Run with reduced overlap for an emissions test.

Either retard the intake cam or advance the exhaust cam and it will run cleaner for the test. If you have the funds buy two gears and you can fine tune your performance also.

**GTI-TRD** · 15-05-2008, 11:59 AM

Originally Posted by oldeskewltoy

stock smallport is 10.3 to 1.

Small port cams are extremely whimpy about 7.4mm lift

oops my bad....

Yeah the smallport cams are whinmpy indeed, I wasnt actually refering to them when I was on about extra lift... I wasnt clear sorry

**turbo4agte** · 16-05-2008, 12:23 AM

Originally Posted by GTI-TRD

A stock smallport has 10.6:1 compression ratio standard. Do these not pass yuor emissions laws? cant imagine .1 increase is going to nudge it over the legal limit.
However the extra lift cams could quite likely do that

Runs 10.3:1, pulls timing, and runs lower duration that bluetop cams just so Toyota could get it to pass emissions.

Toyota has used different cams in their NA engines than forced induction engines. I'd like to think the reason they didn't continue with the bluetop cams was obvious that it put out too much emissions.

**GTI-TRD** · 16-05-2008, 09:08 AM

again.....

Originally Posted by GTI-TRD

oops my bad....

Yeah the smallport cams are whimpy indeed, I wasnt actually refering to them when I was on about the extra lift... I wasnt clear sorry