Used Carrillo Rods

General engine tech -- Drag Racing to Circle Track

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Used Carrillo Rods

Post by fordified » Thu Oct 12, 2017 5:13 pm

I think this may be my first post!

Anyway, I bought a 310" road racing engine that I'm building for drag racing.

It came with Carrillo rods, but I have no idea how many miles are on them. They magged fine and look perfect but who knows their history.

I'd like to use them if possible instead of an aluminum rod. But the engine will see close to 10,000 rpm at the stripe.

Should I buy new rods or give these a shot? I think the answer is to buy new ones but wanted to ask in case I'm being over cautious.

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Re: Used Carrillo Rods

Post by bigjoe1 » Thu Oct 12, 2017 5:53 pm

How much HP will your new engine make ?



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Re: Used Carrillo Rods

Post by fordified » Thu Oct 12, 2017 6:05 pm

Thanks for the reply.

Hard to say. I have a similar engine that makes 771. But, I'm using a better set of heads this time around. I'm shooting for 790. I hate to spin it so high with such poor pushrod geometry, but I don't want to invest in a dart block right now and have the lifter bores offset. The block is a R302 with a bryant crank.

Thanks again.

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Re: Used Carrillo Rods

Post by fordified » Thu Oct 12, 2017 6:09 pm

By the way, the rods don't have a tapered end toward the pin. They're like the old super speedway rods, but have 3/8 bolts. 5.7" long and kind of heavy.

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Re: Used Carrillo Rods

Post by fordified » Thu Oct 12, 2017 6:28 pm

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Re: Used Carrillo Rods

Post by bigjoe1 » Thu Oct 12, 2017 6:54 pm

They will probably last forever- I ,personally, do not like heavy rods



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Re: Used Carrillo Rods

Post by The Radius Kid » Thu Oct 12, 2017 7:05 pm

If you're not sure,send them off to Carillo for checking and refurbishing.
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Re: Used Carrillo Rods

Post by panic » Thu Oct 12, 2017 8:15 pm

X2 - send them back, so you can sleep at night.

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Re: Used Carrillo Rods

Post by PackardV8 » Thu Oct 12, 2017 8:29 pm

bigjoe1 wrote:
Thu Oct 12, 2017 6:54 pm
I, personally, do not like heavy rods.
JOE SHERMAN RACING
Agree, Joe. There has to be a serious need, else heavy rods cause more problems than they offer benefits. Today's better pistons are so light, their inertial forces are lower and thus don't pull rods apart like the heavy slugs from the bad old days.

I'm building a stroker Packard V8 and prevailed on Adney Brown to weld one up for me. I thought I'd want the strongest rods available and spent the bucks for the long BBC Oliver rods. After getting the crank built up, Adney said the Olivers were so heavy it would take too much Mallory metal to balance. He said the Packard wouldn't be making the horsepower or the RPMs to need the Olivers and I'd have a better build with lighter SCAT rods.
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Re: Used Carrillo Rods

Post by fordified » Thu Oct 12, 2017 9:14 pm

Thanks for the replies.

I talked to someone at Carrillo who said pretty much to run the rods and not worry about the rpm. I'm sending them to Carrillo to get check out as suggested.

I also don't like the weight. Kinda scares me for some reason and I don't want the engine to accelerate like a slug. That's not a good thing especially with a small engine.

I was surprised when the topic of rod length came up. I said that I would have preferred a shorter rod like a 5.4" rather than the longer 5.7" rod since I will have a 1.94 ratio with the longer rod. He said that the longer rod will help me at high rpm. I thought the opposite would be true.

Any ideas to share about the rod length and ratio?

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Re: Used Carrillo Rods

Post by The Radius Kid » Thu Oct 12, 2017 9:19 pm

fordified wrote:
Thu Oct 12, 2017 9:14 pm
Thanks for the replies.

I talked to someone at Carrillo who said pretty much to run the rods and not worry about the rpm. I'm sending them to Carrillo to get check out as suggested.

I also don't like the weight. Kinda scares me for some reason and I don't want the engine to accelerate like a slug. That's not a good thing especially with a small engine.

I was surprised when the topic of rod length came up. I said that I would have preferred a shorter rod like a 5.4" rather than the longer 5.7" rod since I will have a 1.94 ratio with the longer rod. He said that the longer rod will help me at high rpm. I thought the opposite would be true.

Any ideas to share about the rod length and ratio?
[-X [-X [-X [-X [-X :shock: :shock: :shock: :shock: :shock: :shock: :shock: :shock: :shock: :shock: :shock:
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Re: Used Carrillo Rods

Post by fordified » Thu Oct 12, 2017 9:25 pm

Ha!

I take it rod ratio discussions are a no-no.

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Re: Used Carrillo Rods

Post by MadBill » Thu Oct 12, 2017 9:45 pm

We've been there, got the scars to prove it.. :(
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Re: Used Carrillo Rods

Post by PackardV8 » Thu Oct 12, 2017 9:56 pm

A search will bring up more opinions and a few facts about the effect/non-effect of rod length versus RPM than you can read in a month.
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Re: Used Carrillo Rods

Post by fordified » Thu Oct 12, 2017 10:04 pm

Thanks for the heads up.

Today was my first post but I've visited this site many times over the years. Great information here and lots of interesting discussions.

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