General question about higher redline.

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Jun 13, 2006 | 06:29 PM

#11

Derf00

Gentleman's Relish

Joined: Feb 2005

Posts: 13,189

From: AZ

RE: General question about higher redline.

Quote:

ORIGINAL: uptime

I noticed that on some dyno videos whoever drives the car (on the dyno) sometimes go above the redline... which should be dangerous(?)

I also understood from a friend that the main issue with going above the redline is because the motor runs too fast which cause less oil to get to the right places...

so I was wondering what if you use a thicker oil (synthetic?)?

I know that it might sound stupid... but I just started to really learn how engine works (I'm only 19

)

Thanks.

Depends - Most stock cars don't produce much power above their redline so it's pointless to change the redline just for the sake of changing it - in the case of the dyno graphs you're seeing the car probably has a different tune that stock with pushes the powerband up a bit and slightly out beyond redline (though not much)

He's partially correct, the engine does rev higher than it's STOCK limits can handle. You get things like Valve float (already mentioned) rod bearings getting spun, the potential of sending a piston connecting rod through the pan since the rods aren't designed to rev that high (if you go way beyond redline) they will literally blow the piston assemblys apart.

The oil thing is less of an issue these days because of tighter tolerances. Although many highend high reving cars use a dry sump oil system that gets rid of this concern. You can add an aftermarket dry sump to a mustang but it's pretty pointless unless your car is a RPM monster.

As for sythetic vs regular oils. The oils weight for weight are equal meaning that 5W-30 is the same no mater what brand. What you're probably thinking of is the molecular weight. Synthetic oil has a very consistent molecular structure which means it's molecular weight is also consistent. These molecules are smaller than natural oil.

Natural oil has (in many cases) a random number of excess carbon atoms on each molecule of oil, therefore the weight and size of each molecule can vary significantly. Think of a piggy bank with the slot at the top that is made to fit only pennies. A penny is of consistent weight and size, then try to stick a quarter in a penny slot, doesn't fit. Same with oil, tighter tolerances means oil passages can get plugged if the oil gets old or is saturated with carbon (sludge)

Jun 13, 2006 | 08:38 PM

#12

weasel1088

2nd Gear Member

Joined: Mar 2006

Posts: 394

From:

RE: General question about higher redline.

Quote:

ORIGINAL: uptime

Quote:

ORIGINAL: weasel1088

here is my guess.....oh and im 17

revving so high the valves almost get shot open, or pushed open so fast that they lost contact with the cam and stay open too long.....or am i way off[&:][&:]

yeah, that's was my guess as well, and that's also why I mentioned 'high tension springs'.

I was sure I'm the youngest on the forum, it's good to know young guys like me who like mustangs! [sm=happybounce.gif][sm=smiley20.gif]

Nice to see the young guys eh?? haha.

Jun 16, 2006 | 11:33 AM

#13

uptime

Thread Starter

Joined: Feb 2006

Posts: 39

From:

RE: General question about higher redline.

Quote:

ORIGINAL: weasel1088
Nice to see the young guys eh?? haha.

Yeah it is... but not only young, most of the young guys I see around would choose Honda / Acura... you know the whole ricer thing, stickers, bigass spoiler (which I think is nice one SOME of the cars).

So it's nice to see young guys who like Mustang, like me [sm=americanasmiley.gif][sm=gears.gif][sm=smiley20.gif]

---

Anyway, like most of the people said, there's no point of moding the engine like that instead of just throw a KB...

Thanks!