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Old 11-27-2005, 04:23   #1 (permalink)
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What would putting 302 rods on a 351c do?

I found out today from the original owner of my new coupe that he thinks the guys who did his engine put 302 con rods on the 351 clevo thats in it for some reason to increase something...what would this be?
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Old 11-27-2005, 06:15   #2 (permalink)
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Re: What would putting 302 rods on a 351c do?

Quote:
Originally Posted by Young Angus
I found out today from the original owner of my new coupe that he thinks the guys who did his engine put 302 con rods on the 351 clevo thats in it for some reason to increase something...what would this be?
this combo works well and increases the dwell time of the piston at TDC.
it also gives your motor the so-called best conrod to stroke ratio, 1.71:1.
it improves mid-topend performance and will help your heads flow better than shorter rods. i did this combo to a mild 351 and picked up 24hp and 2 tenths down the quarter mile.
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Old 11-27-2005, 06:33   #3 (permalink)
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Re: What would putting 302 rods on a 351c do?

Quote:
Originally Posted by Young Angus
I found out today from the original owner of my new coupe that he thinks the guys who did his engine put 302 con rods on the 351 clevo thats in it for some reason to increase something...what would this be?

It increases the length of the connecting rod from 5.780" to 6.02".

It increases the nearness of the piston pin to the top of the piston.

It increases the reduction in dynamic compression ratio of engines with camshafts with a good bit of valve overlap.

It increases the piston dwell time at/near TDC.

It increases the reduction of dwell time at/near BDC.

It increases the weight of the connecting rod used in the rotating assembly.

It (probably) increases the reduction of weight in the piston used in the rotating assembly.

It likely increases the controversy in discussing rod lengths and what is better/worse/best/good enough.


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Old 11-27-2005, 12:03   #4 (permalink)
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Re: What would putting 302 rods on a 351c do?

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It likely increases the controversy in discussing rod lengths and what is better/worse/best/good enough.


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Hahaha i like that last one!

Cheers for that
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Old 11-27-2005, 13:43   #5 (permalink)
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Re: What would putting 302 rods on a 351c do?

The reason my motor runs 302C rods, is because the appropriate piston was lighter. This reduces the load on the rods.
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Old 11-28-2005, 00:40   #6 (permalink)
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Re: What would putting 302 rods on a 351c do?

Yep, as above.

Just so you know, the pistons to match are called "short deck" pistons. If you keep a stock 351 piston on a longer rod, you'll obviously have issues with them trying to escape out the top of your heads
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Old 11-28-2005, 06:21   #7 (permalink)
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Re: What would putting 302 rods on a 351c do?

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This reduces the load on the rods.
Yeah? By how much?

What was your "before" piston weight and "after" piston weight? Also, what of the differences in weight of the rods themselves?


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Old 11-28-2005, 14:00   #8 (permalink)
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Re: What would putting 302 rods on a 351c do?

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Originally Posted by davis
Yeah? By how much?

What was your "before" piston weight and "after" piston weight? Also, what of the differences in weight of the rods themselves?


:davis:
According to ACL, 302C rods are 12 grams heavier than the 351C rods.

The long rod ACL pistons are 72 grams lighter than their 5.778" rod pistons. The 6" Rod Ross pistons are 30 grams lighter than their 5.778" Rod Piston.
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Old 11-28-2005, 14:35   #9 (permalink)
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Re: What would putting 302 rods on a 351c do?

As Davis suggested, i think this may open up the old debate of long vs. short rods.

I use 6.250 rods and Ross custom pistons, not because of weight, but because they give the engine characteristics i want.

I drive a car with a wheelbase 16 inches shorter than a Hyundai Excel and wanted more mid range and top end power than stump pulling torque at 1500rpm.

cheers
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Old 11-28-2005, 21:59   #10 (permalink)
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Re: What would putting 302 rods on a 351c do?

What are you driving gus351?
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