Reply to thread

See what others are reading now! Try Forums > Current Activity

Message: <blockquote data-quote="shiroitenshi" data-source="post: 1337908" data-attributes="member: 27518">You're quite right on that point, but the reason is that if we're running oversized valve sizes, there might not be enough clearance in between when both valves are at their max lift. which is why most manufacturer of cam specifically states that oversized valves should not be used with their high lift cams. I think only those specially manufactured heads have deeper valve seats to prevent this problem, though I'm not sure how much lift it allows, as I've never seen a dart-racing CNC'ed head with recessed valve seats in real life before. I think both crower and toda have this same disclaimer in their manual/catalogue. And I wouldn't say so about the valve will never hit high comp piston. At high revs, the rod actually stretches a bit and with a high lift cam, ker-thunk! Bye bye head.. (hence the required minimal clearance) It happened to one of the civic enthusiasts group I'm in (not an official group, just like minded people) when he bounced on a bump, misshifted, and the rev meter went well past the meter marks , over 10K i think, and thonk! 4 cylinder engine became 3, and somehow the engine died immediately. No broken rods, but damaged a B18C piston, broken valves, damaged head, B16B cam lobes got a piece chipped off (bye2 cam). Luckily he opted to tow the car immediately after that, or there would have been more damage as bits of vavles started traveling into the manifold and into the other combustion chambers. Seems like (in my opinion, that is) we should have a safe zone clearance value depending on rod material, (and those aftermarket ones usually tend to be a lot more resistant to stretching,  Thanks for the claying info... sure is a creative way to test clearances.. Too bad it requires disassembling the head though. No biggie though. Thanks for the head's up.I'll give it a shot. Thanks again.</blockquote>

Verification

The Marketplace Latest

Perodua Alza convert new facelift body parts
- Started by jeff6126
- Exterior and Body
BMW E60 Msport Body Kit
- Started by jeff6126
- Exterior and Body
BMW F30 M3 mperformance front skirt lip
- Started by jeff6126
- Exterior and Body
Honda City 2014~19year Drive68 body kit
- Started by jeff6126
- Exterior and Body
Perodua Alza gear up body kit / spoiler
- Started by jeff6126
- Exterior and Body
Proton Saga Mix body kit
- Started by jeff6126
- Exterior and Body
Mitsubishi Lancer JS GTwing spoiler
- Started by jeff6126
- Exterior and Body
Honda Civic FD TypeR body kit
- Started by jeff6126
- Exterior and Body
Proton Satria GTi body kit / Evo front bonnet hood
- Started by jeff6126
- Exterior and Body
BMW F30 gts front bonnet hood with scoop
- Started by jeff6126
- Exterior and Body

Posts refresh every 5 minutes

Tesla Model X's Falcon Wing doors explained

http://www.zerotohundred.com/newforums/../wp-content/uploads/2016/07/tesla-model-x-doors-625x380.jpg

The dual-hinged doors on Tesla Model X is like a modern day sophisticated gullwing. For engineering enthusiasts...

Auto Transmission Rebuild

I used to post in this section but Mr Moderator moved me to Perdana V6 section. I prefer to be here so I'll start writing here instead. No offence to the other forums, but I think it will be better to stick to...

how to cnvert a turbo to supercharge??

need help from sifus...
i what do i need and how??

Search

Enjoying Zerotohundred?

Log-in for an ad-less experience

Reply to thread

The Marketplace Latest

Perodua Alza convert new facelift body parts

BMW E60 Msport Body Kit

BMW F30 M3 mperformance front skirt lip

Honda City 2014~19year Drive68 body kit

Perodua Alza gear up body kit / spoiler

Proton Saga Mix body kit

Mitsubishi Lancer JS GTwing spoiler

Honda Civic FD TypeR body kit

Proton Satria GTi body kit / Evo front bonnet hood

BMW F30 gts front bonnet hood with scoop

Posts refresh every 5 minutes

Recent Posts

Performance Tire Prices(Pls Contribute The Price & Location to buy)

Tire Price list Zth

Paging for Hyundai Coupe owner, CCGT @ 28th May 2005

New GR Yaris Automatic & GR Supra Track Edition Now in Malaysia

2025 Volvo EX90 Wins World Luxury Car Award

Search

Online now

Enjoying Zerotohundred?