306 Long Rod? Whats the deal?

155dB5.0

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Jul 2, 2003

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Upper MI

Dec 14, 2003

#1

• Dec 14, 2003

• #1

Just wanting to know whats so good about a 306 Long Rod? What benifites does it have and dose it make more power than a normal 306? Also can you get a long rod in any other size?

Thanks Darren

 

Xtreme Limits

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#2

• Dec 14, 2003

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It makes more power only because you can rev the piss out of it.....7500-8000 compared to 6000-6500. because of the 1.8 rod ratio, so you pistons speed is lower per given rpm, so you can run a big big cam...... but sucks for daily driving

 

TheRedBlur

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#3

• Dec 14, 2003

• #3

from what I've heard, the long rod means that you can use a shorter piston which is more stable because the wristpin is closer to the top of the piston. I don't think that the long rod makes more horsepower so much as it has more potential. i dunno though

 

Xtreme Limits

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#4

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Yes you can put longer rods in all types of motors, e.i. sbc 5.7 stock,6-6.25 long. 351w up to 6.25 long rod, but 5.4 is the biggest you can fit in a 302.

 

Xtreme Limits

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#5

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long rods also incress dwell time witch give more hp 3hp or 4hp being used on same motor. long rod motors will also last very very long, just look at honda motors! even ford put longer rods in there 4.6's

 

TheRedBlur

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#6

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I don't get how changing the rod size will affect piston speed. the piston travel is the same, I thought a shorter stroke will lower travel i.e. piston speed per stroke

 

155dB5.0

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#7

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Why would they drive/run like crap for daily?
I do not drag race, i do more autocross and roadrace+ agressive street driving

Darren

 

Xtreme Limits

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you missunderstood, i ment it would suck driveing with a big cam on the street. haveing a big cam with a long rod motor becasue thats the hole point (addvantage)of running one to crank out more rpms/or longer stastined rpms. its pistons G's that decress with a long rod motor

 

matty50racer

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A longer rod makes the angularity of the rod less, making it easier on pistons and give a better ring seal. A long rod also increases the dwell at the TDC and BDC for better scavenging and INCREASES the piston speed in between to make up for that. The shorter pistons are also lighter, helping the motor rev easier.

 

155dB5.0

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#10

• Dec 14, 2003

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So would this not be very ideal for my aplication?
And are there cams that i could still spin high RPMS but have a good streetable cam?

Darren

 

matty50racer

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#11

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155dB5.0 said:

So would this not be very ideal for my aplication?
And are there cams that i could still spin high RPMS but have a good streetable cam?

Darren

Click to expand...

Depends on what you consider streetable. A high RPM cam will not idle very well, and requires you to cruise, and shift at a much higher rpm than you are used to. I think of these things as being awsome , but some people don't like these traits, and want there car to drive like stock, wich it won't.

 

C

californiaHG

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#12

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I dont know exactly HOW it works, but variable valve timing would give the best of both worlds. However I don't know if it would be in any way possible on a non modular engine because of the placement of the cam and whatnot... hmm, anybody know if that would be possible?

 

K

kystang1889

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ky

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#13

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Ok so what would the advantage be over a 347 compared to a 306 long rod? cost

 

SnwMnkys

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#14

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Xtreme Limits said:

Yes you can put longer rods in all types of motors, e.i. sbc 5.7 stock,6-6.25 long. 351w up to 6.25 long rod, but 5.4 is the biggest you can fit in a 302.

Click to expand...

Actually its 5.565" rod.

 

TheRedBlur

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#15

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I heard from somewhere htat variable valve timing is coming to us push-rodders. but, as usual, they are being developed on the 350, so us ford guys wont see it for a looong time

 

90mustangGT

I felt sorry for girls because

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#16

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I agree with Matty50. A long rod 306 would have better rod ratio, which puts less force on the cylinder walls and directs it more on the crank. That is part of the debate bewteen the 331 vs. 347 debate. The long rod would use shorter pistons with a higher wrist pin. I don't know if the hp:$$ ration would make it worth it. I don't really know enough about the LR 302 to tell you anything.

 

Xtreme Limits

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#17

• Dec 14, 2003

• #17

kystang1889 said:

Ok so what would the advantage be over a 347 compared to a 306 long rod? cost

Click to expand...

the ability to make high hp with less CI's , and beeing able to rev like a boss 302(8000rpm) good for trans am racing, and drag racing....

 

A

Asgard

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#18

• Dec 14, 2003

• #18

Would the stock block take 8k rpm?

 

Xtreme Limits

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#19

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Asgard said:

Would the stock block take 8k rpm?

Click to expand...

yes, but girdle and studed.....