Hydraulic tappet ?

ZeeYouLater · 04-16-2011, 07:24 AM

Hi mechanics,is the 370z camshaft system hydraulic tappet driven ?

Hydraulic tappet - Wikipedia, the free encyclopedia

Why there are on the service manuel EM.pdf page 141 so many AVAILABLE VALVE LIFTER (788-840) types with mm stamps available?

And if not what does this mean about milage and rev up abuse for us (how to check)?

Any infos from 350z drivers are welcome; seems to be the same construction execpt of vvel.. (only exchange with no lift adjustment)

BR,
ZeeYouLater

dawudih · 04-23-2011, 11:07 PM

I'm not 100%, but car engines primarily use hydrolic lifters (maintenance free) & sports bikes use solid lifters (higher performance & maintenance). There were a few Toyotas & hondas that used solid valvetrains, I think in the late 80's, but it's primarily used on high performance bikes.
The Nissan probably uses hydraulic lifters on the exhuast; I don't think it has a traditional cam on the intake side. I've seen an Infiniti's head & it has a complicated lever system to control the intake valves lift & duration while the throttle butterfly is almost always wot to reduce pumping losses.

Q8y_drifter · 04-24-2011, 12:40 PM

I don't think having the VVEL system has anything to do with the type of lifters or whether or not the VHR uses them to begin with. The VHR still uses conventional valves and therefore uses lifters. In this case, the lifters are the hydraulic type just like the HR.

EDIT: Here's a pic

1slow370 · 04-24-2011, 08:56 PM

mechanical lifters the multiple part numbers are for the different thicknesses of lifters available when setting the lash. they shouldn't need adjusting for a LONG @ss time though. the intake and exhust lifters are the same size but the face of the intake lifter is coated to reduce friction as the vvel cam leg isn't lubricated correctly without it.

dawudih · 04-25-2011, 01:13 AM

The image above labels the bucket as a valve lifter. Since there is a bucket there, there will be a shim beneath it. This means the valvetrain will need adjustment, by changing the shims out to thicker/thinner ones, periodically (15k on motorcycles is the new standard). There is also no traditional cam shaft, but a series of levers to control the lift & duration of the intake valve. This is a high performance set-up normally not used on street cars.

04-16-2011, 07:24 AM	#1 (permalink)
ZeeYouLater Base Member Join Date: Dec 2009 Location: Swiss Posts: 39 Drives: 370z Roadster Rep Power: 15	Hydraulic tappet ? Hi mechanics,is the 370z camshaft system hydraulic tappet driven ? Hydraulic tappet - Wikipedia, the free encyclopedia Why there are on the service manuel EM.pdf page 141 so many AVAILABLE VALVE LIFTER (788-840) types with mm stamps available? And if not what does this mean about milage and rev up abuse for us (how to check)? Any infos from 350z drivers are welcome; seems to be the same construction execpt of vvel.. (only exchange with no lift adjustment) BR, ZeeYouLater __________________ ___________________________ 7AT. NAVI. 19". (Sport and Touring Package) Last edited by ZeeYouLater; 04-16-2011 at 08:29 AM.

04-23-2011, 11:07 PM	#2 (permalink)
dawudih Base Member Join Date: Mar 2011 Location: Katy, TX Age: 49 Posts: 93 Drives: 2011 370z auto Rep Power: 14	Solid vs Hydraulic lifters I'm not 100%, but car engines primarily use hydrolic lifters (maintenance free) & sports bikes use solid lifters (higher performance & maintenance). There were a few Toyotas & hondas that used solid valvetrains, I think in the late 80's, but it's primarily used on high performance bikes. The Nissan probably uses hydraulic lifters on the exhuast; I don't think it has a traditional cam on the intake side. I've seen an Infiniti's head & it has a complicated lever system to control the intake valves lift & duration while the throttle butterfly is almost always wot to reduce pumping losses.

04-24-2011, 12:40 PM	#3 (permalink)
Q8y_drifter Enthusiast Member Join Date: Mar 2010 Location: Kuwait Posts: 306 Drives: 08 Infiniti G35 5AT Rep Power: 15	I don't think having the VVEL system has anything to do with the type of lifters or whether or not the VHR uses them to begin with. The VHR still uses conventional valves and therefore uses lifters. In this case, the lifters are the hydraulic type just like the HR. EDIT: Here's a pic __________________ 08 G35 5AT Sedan \| Stillen CBE \| Invidia HFC \| Injen CAI \| Uprev Tune \| Akebono BBK \| Tanabe Coilovers \| Hotchkis Sway Bars \| GTSpec FSB \| Black Headlights & Grille \| Volk GT-F Wheels \| Hankook V12 Evo Tires

04-24-2011, 08:56 PM	#4 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	mechanical lifters the multiple part numbers are for the different thicknesses of lifters available when setting the lash. they shouldn't need adjusting for a LONG @ss time though. the intake and exhust lifters are the same size but the face of the intake lifter is coated to reduce friction as the vvel cam leg isn't lubricated correctly without it. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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04-25-2011, 01:13 AM	#5 (permalink)
dawudih Base Member Join Date: Mar 2011 Location: Katy, TX Age: 49 Posts: 93 Drives: 2011 370z auto Rep Power: 14	The image above labels the bucket as a valve lifter. Since there is a bucket there, there will be a shim beneath it. This means the valvetrain will need adjustment, by changing the shims out to thicker/thinner ones, periodically (15k on motorcycles is the new standard). There is also no traditional cam shaft, but a series of levers to control the lift & duration of the intake valve. This is a high performance set-up normally not used on street cars.