How do u make a high reving motor

[TurboNG]

Lets do a Thread on this
List the do's and don'ts on this!

[mustangboy]

Quality rods/fasteners, proper balancing/harmonics and a really good valvetrain are a couple places to start. Alot will say lightweight parts helps a bunch too.

[IWRBB]

Valve control.

[Jeff88coupe]

Well besides a well built bottom end you need all the top end pieces to support making power at higher rpms. Good flowing heads with the proper valve spring/retainer/rocker arm package to a cam that is matched to the rest of the motor. Light weight zero balanced internals help also with the motors acceleration rate. The valve train setup become very critical the higher you push the rpms.

[Pitbull1052]

what's high revving to you? My 347 spins up to about 7,000 I keep it below that but it has no problem doing so........ and which motor are we talking about 302, 2v, 3v, 4v, Coyote etc.........

[Mista Bone]

keep the piston speeds in check.....

[SCHMUCKINGHAM]

Yates heads and a good bottom end :)

[TurboNG]

what's high revving to you? My 347 spins up to about 7,000 I keep it below that but it has no problem doing so........ and which motor are we talking about 302, 2v, 3v, 4v, Coyote etc.........

We are in the winsor section so let's say 302/351 base motors

[TurboNG]

I was told that hydraulic cams are bad over 7k rpm to go with a solid CAM

[k062693w]

One word ... MONEY $$$ LOL

[Blowpastyou]

I revved mine to 9k a couple times no problem. 8500 is the limit now. Ask 2jz on here how to rev a hydraulic roller to 8k or higher with no float! The dyno graph is still going straight up when he shuts it off @8000

[Black Horse]

Lets talk to the basics of high reving success: It's basic physics!
1) Light weight components - pistons, rods - lower that rotational mass!
2) Proper valve springs - too weak you get valve float, too strong you get resistance and deflection issues
3) Flow, flow, flow! Intake, exhaust - flow is king!
4) Component strength - higher forces require stronger components - forces with increased revolutions increase nearly exponentially.
5) Proper timing/engine control management
6) Proper lubrication but minimizing the amount of oil "swept" by the crank
7) Tighten tolerances but allow better freedom (less friction)
8) Balance, balance, balance - dynamic considerations for harmonics!

Thats a few of the basics to start with!

[Pitbull1052]

I dunno I've got a roller and most everyone I know that revves up in that range does as well. For me id say with my combo it's a combo of the 347 the je pistons, the h beam rods, and a balanced and lightened rotating assy alum fly wheel alum drive shaft etc msd ign etc..... and like everyone says lots of money

question is what are you trying to accomplish? what's the goal?

[Pitbull1052]

Lets talk to the basics of high reving success: It's basic physics!
1) Light weight components - pistons, rods - lower that rotational mass!
2) Proper valve springs - too weak you get valve float, too strong you get resistance and deflection issues
3) Flow, flow, flow! Intake, exhaust - flow is king!
4) Component strength - higher forces require stronger components - forces with increased revolutions increase nearly exponentially.
5) Proper timing/engine control management
6) Proper lubrication but minimizing the amount of oil "swept" by the crank
7) Tighten tolerances but allow better freedom (less friction)
8) Balance, balance, balance - dynamic considerations for harmonics!

Thats a few of the basics to start with!





Yea what he said!!!!!!

[Blowpastyou]

Doesn't take alot of money. Just money spent in the right spots, I have 4k in my motor

[cyah92]

Well atleast im getting some pointers on high rev engines thanks 4 opening this up

[TurboNG]

Ok what about bearings? Any special ones?

[TurboNG]

I have a 349 NA I'm thinking about going higher RPMS shift at 6,600-6,800 now.
I have stage 2 TW ported heads and a R box intake breathing is not an issue, aluminum Fly and driveshaft, aluminum race crank pulley:
So I need to do a good rotating assembly with light H-beams, check my valve springs to see if they will work, and get a Cam to match a 9kRPM PULL
MB go to 3"exhaust Car will be dyno tuned SCT anything else I may need to consider?

[03z06vette]

Yates heads and a good bottom end :)

Hmmmm!!!!!!

[Jeff88coupe]

A stock a9l or p computer crystal chip will not like seeing 9Krpms.

[03z06vette]

crowler crank, oliver rods, perfect ballance and yates heads. I would like to think i could safely see 8.5-9k

[85_SS_302_Coupe]

Nothing fancy...Eagle crank/rods, ARP bolts, stout valve sprints and good roller rockers, a cam that's built for high RPM (AFM N-91), single plane intake, a carb that can breath, and the balls to let it eat. Mine's been at 7500 before but i prefer to keep it under that. I don't have a rev limiter so as soon as the tires break loose it usually hits 6500. I've never experienced any valve float and i run stock FRPP lifters. Again, it just depends on what you consider high RPM....F1 cars idle at around 4k :lol:

[cyah92]

7000 too 8000 rpm would consider ads a high rev stock mustang i thinl red lines at 5500

[flyin2jz]

HI rev stuff with a hr cam gets a little more tricky than a solid roller. I used to rev my old 306 to 7200 with stock crank and rods without issues and an anderson n111 cam. Now its a little more beefed up in the bottom end but it all starts with valve control. Lightweight valves,retainers and i use solid roller springs with a hr cam and use linkbar lifters just in case. Ive seen stock hr lifters spin to 8k with the right stuff. THere a just alot of secrets that those guys use to get it done. I use all off the shelf stuff and dont bottom out the lifters and have never seen valve float up to 8100 which is where we shut it off at. Its still rising slightly on the dyno but i dont have the sack to go above 8100 for fear of oil cavitation with a wet sump. Dry sump id go higher but im a bit to cheap for that. Anderson has a great spring package for a lowish hi rev motor that are good to 7200 and they are cheap"136 bucks". I ran them for years without any tricks and stock retainers and lifters. Look this guy up on the net. Marc Arnold. He is who i mocked most of my stuff after. He just went to a solid and only picked up a tenth or so over his old hyd roller combo.

[cyah92]

Interesting stuff im glad theres guys like u because i would b lost so i will just let the experts put together a good motor 4 me

[TurboNG]

I believe in taking everyone's experiences adding it all up and keeping the repeated facts and tossing the ones that dont.
Someone elses hind sight can be my 20/20 future

[Brandon Alsept]

Look at the NMRA Pure Street rules, those 5.0s are reving to 8500-9000 and they run stock roller lifters ;)

Just build a modular LOL

[flyin2jz]

Brandon knows a thing or two about high rev motors. Lol

[Brandon Alsept]

a thing or two maybe lol

leave the line at 7500-8000 and shift around 8700-9000

[Timido]

If it is a 351 based motor get a dart block the 3" mains dont like a lot of RPM keep the stock 351 block under 7000 RPM. Brandon cheats he has no pushrods. Go find some small motor NMRA Hot Street Cars 360 CID and you will find out what makes those motors REV that high $$$$$$$$$$

[flyin2jz]

My 347 na combo makes 504rwhp on the dyno at 8050rpms. That's chump change considering purestreet guys make about the same power with a systemax intake,310 ci motors and under 500in lift cams. It does cost some money to get this done though. I think my valvesprings were around 460 bucks. But since the pressures have to be spot on it takes the exact stuff or things break quick. It's best to model the combo after someone who has done it so it doesn't drain your bank account.

[Pitbull1052]

Holy shiz if u don't mideast what's your combo that's sick