Camshaft question
02-17-2012, 12:46 AM
#1
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Camshaft question
I'm buying a new TC tomorrow and was wondering if the cams in these 2.5l engines are 3 lobe on each cam per cylinder like the ivetch's on the civic K20z3 motor?
Last edited by rr1982; 02-17-2012 at 02:47 AM.
02-17-2012, 02:04 AM
#2
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If you are talking about the lobe profile of one lobe, no car has 3 humps per lobe. If you are talking about 3 cam lobes per cylinder, then the engine needs to have 3 valves per cylinder, not unless the engine manufacturer cheeped out and put a forked rocker so that one lobe could drive 2 valves...bottom line, what difference does it make?
02-17-2012, 02:46 AM
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I forgot to say I was a new member here. Anyways, I have engine building experience, so I was trying to get some "useful" information from "knowledgeable" members about the more detailed specs on this engine. Just to let you know what the difference is EOIO3, the Honda K20z3 has 3 cam lobes per shaft per cylinder and is 4 valves per cylinder, if you need more info on it's design I'd be glad to provide it for you or you could look into it yourself.
If you are talking about the lobe profile of one lobe, no car has 3 humps per lobe. If you are talking about 3 cam lobes per cylinder, then the engine needs to have 3 valves per cylinder, not unless the engine manufacturer cheeped out and put a forked rocker so that one lobe could drive 2 valves...bottom line, what difference does it make?
Last edited by rr1982; 02-17-2012 at 02:57 AM.
02-17-2012, 06:17 PM
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Yes, the VVTI system just controls timing (advance/retard) where as VTEC uses the third lobe to achieve greater lift and duration.
The only comparable system that Toyota has to Honda's VTEC is VVTLI, which is Variable Valve Timing and Lift with Intelligence. This controls the timing as well as having a third lobe to achieve greater lift and duration while optimizing the power curve.
The only engine that had/have the VVTLI is the 2zz found in the celica gt-s and the corolla xrs and the matrix xrs.
If I am wrong don't flame me, just correct me. Thank you.
The only comparable system that Toyota has to Honda's VTEC is VVTLI, which is Variable Valve Timing and Lift with Intelligence. This controls the timing as well as having a third lobe to achieve greater lift and duration while optimizing the power curve.
The only engine that had/have the VVTLI is the 2zz found in the celica gt-s and the corolla xrs and the matrix xrs.
If I am wrong don't flame me, just correct me. Thank you.
02-17-2012, 11:07 PM
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No you're fine - polite and informative. That other poster came outta nowhere with totally uneducated incorrect info and then ended with "bottom line, what difference does it make", which wasn't a very polite way to end a post and certainly no way to welcome a new member. Thanks.
I wish lol
02-17-2012, 11:47 PM
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I wish they would have put Lift into this motor.
Would have really made a distinction between the Camry and the tC.
But I really like the fact that the tC is less than $20K. For that, I think it balances out.
But yes I do wish they would have put Lift in.
Would have really made a distinction between the Camry and the tC.
But I really like the fact that the tC is less than $20K. For that, I think it balances out.
But yes I do wish they would have put Lift in.
02-18-2012, 12:47 AM
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What is the lift, intake and exhaust? Is it more than the Camry motor's?
02-18-2012, 02:22 AM
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I don't know about Toyota engines, but all the "Big Name" Honda race tuners (Toda for example) eliminate the variable valve timing on all their cams...they say they get more power quicker without it. So, I don't think you're missing much.
02-20-2012, 11:17 PM
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Toda and all the Honda tuners eliminate the "street" lobe out of the cam. So they use the "race" cam lobe for the entire rev band of the motor. Sure they may make more power up near 8K rpm, but they won't have anything down around 2K rpm, where most of our "street" driven motors live.
02-20-2012, 11:19 PM
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The only differences are the intake and exhaust systems.
The "Lift" that I was talking about is the Lift system used in the Celica GT-S, Corolla XRS and the Matrix XRS, which all had the 2zz engine.
02-21-2012, 12:18 AM
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I was wondering what the lift specs. were on the TC cams?
I don't know of the exact amount of Lift. But from all the articles I read and Toyota techs that I've talked to they say that the tC motor is the same that is in the Camry.
The only differences are the intake and exhaust systems.
The "Lift" that I was talking about is the Lift system used in the Celica GT-S, Corolla XRS and the Matrix XRS, which all had the 2zz engine.
The only differences are the intake and exhaust systems.
The "Lift" that I was talking about is the Lift system used in the Celica GT-S, Corolla XRS and the Matrix XRS, which all had the 2zz engine.
02-21-2012, 09:54 AM
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03-01-2012, 06:42 AM
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I'm not sure if there is anything out for the tC yet, but I'm not sure if there ever will be due to the vvti system. But if I am wrong, fellow people chime in.
03-07-2012, 09:20 AM
#19
And being a previous Honda owner etc I have my pros and cons between the two. Vtec and ivtec are different just so ppl understand, ivtec is most comparable to modern vvti systems etc.
03-08-2012, 03:47 PM
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