4agte cams: bluetop vs redtop

[l1ttle_d3vil]

there seems to be a pretty common opinion that bluetop cams are better than the redtop cams on n/a 4ages, but I've read somewhere that the redtop cams are better for turbo engines. is this true?

if so, does this only apply when putting bluetop cams into smallport redtops? I've got an aw11 4agze (bigport), so will this have the same cams as the bigport bluetop (seeing as both are bigport)?

and as for swapping the cams, is there anything in particular I should pay attention to when putting them in? and do all the bolts/nuts etc get tightened to a specific torque, or just tighten them right up?
obviously the new cams would go in at the same angle the old ones were removed at, so all the timing should remain OK won't it? is there anything else worth doing to the cams while I've got them out?

sorry if this has been covered before, ive done a few searches and havent got any definite answers.

cheers.

[bluemaumau]

na gzes have different cams to bluetops

[thegreatestben]

aw11 gze's are equivelant to redtop bigports

[2LTR Rona]

and as for swapping the cams, is there anything in particular I should pay attention to when putting them in? and do all the bolts/nuts etc get tightened to a specific torque, or just tighten them right up?
obviously the new cams would go in at the same angle the old ones were removed at, so all the timing should remain OK won't it?

Before removing any cam covers or whatever have the engine sitting there TDC firing on number 1 cylinder. Once the replacement CAMS are in would pay to re-check timing.

Yes there is a specific sequence & torque setting for tightening everything up, I dont have the info on me at the mo so someone else may be able to provide. Something else you may want to think of is clearances for the shims as well with the new cams going in.

[Barks]

Someone with access to the Toyota parts system should be able to confirm this for me, but it's my understanding that the bigport 4AGZE (series 1 and 2 motors) have the identical camshafts to the smallport N/A motors, and when I say identical, a mate who works at Waikato Toyota told me that they carried the same part number.

I've also been told, though I haven't had a chance to try it out on my GZE yet, that putting bigport N/A cams into a bigport supercharged engine does help it out some. The tech pages on club4ag.com have the specs for the cams, and the bluetop cams have a few extra degrees of duration and a mm or so of extra lift in them.

[Mr Revhead]

ok, heres the facts:

bluetop has cams with slighty more lift/duration than the redtop ones

all redtop engines (na/4agze/bigport/smallport) have the same cams


debate has raged over the bluetop cams being better than the redtops for different applications, seems to work on FI but loses out on NA

[ants_ae92]

Changing the cams you will also need to re-shim/check the shim to camshaft clearances. If you have a toyota engine manual it would be good, as it would show you how to check with feeler guages and what size shims to change to.

[Barks]

If you're going to change cams and rev the crap outta your engine, here's a handy tip (if it hasn't already been mentioned)

The shim-over-bucket arrangement from the 4AGE/GZE can be replaced with the one piece bucket from the Yaris engine. It takes a while to work out the sizes, but once it's done there's no chance of flicking a shim out while using cams with aggressive lift.

I mentioned this to Brent at Waikato Toyota, and he passed it on to several race and rally guys he knows in the Waikato, they tried it, and it works perfectly, bit of an exercise in calculation, although one of the guys just ordered all of the same buckets and machined his valves to give the correct clearances.

[Mr Revhead]

yeah thats an old trick
have to be from the 1s engine
the TRD items are pretty close in price to those