Thread: K1 vs Crower Comparison

nice detailed pics. ok the indentations (is there a name for that?) which are obviously to help reduce weight, how they have them on diff parts of the rods are interesting.

Some interesting notes:

1. Crower rod bolts appear to be a few mm longer for whatever reason
2. Crower has more support ribbing on the crank side
3. K1 has a slightly wider area where thecrank end transitions into the rod
4. Crower is slightly wider on the straight portion
5. K1 has 2 oil holes pointing down vs Crower has 1 pointing straight up
6. As far as thickness goes they appear to be more or less equal

dont forget retail prices. and as far as the oil holes go, do you know how it is on the stock rods?

Originally Posted by darsondriss

Some interesting notes:
1. Crower rod bolts appear to be a few mm longer for whatever reason

definite +

Originally Posted by darsondriss

2. Crower has more support ribbing on the crank side

ditto

Originally Posted by darsondriss

3. K1 has a slightly wider area where thecrank end transitions into the rod

HUGE difference isn't it. You had the holes lined up perfectly, right? That is a big plus for those K1 rods. I really thought it would have been the other way around (ie, check the shoulders on the 07 rods vs stock rods. huge difference as well.) It's not just how tall they are but how wide the support goes out to the sides. That's a huge difference, although they are certainly both sick rods.

Originally Posted by darsondriss

4. Crower is slightly wider on the straight portion

Also backwards from what I expected. I expected the K1 to be wider but I think because of the crower's wider "neck" it can have it's smaller "shoulder" as above. Plus Crower rods are forged are they not?

Originally Posted by darsondriss

5. K1 has 2 oil holes pointing down vs Crower has 1 pointing straight up

This is a big deal as well. the b15 rod used the same (large) hole on the top of the rod to get oil directly onto the pin but it just comes from environment. Inside of these engines are a torret of oil and at 90* B/A TDC it can catch a good bit of oil in that big ass hole.

The K1 rods are way more modern, just like the b16 rods, which have the oil supplies for the wrist pins coming from the high pressure oil rail. That's definitely a more pro way of doing things. This is a huge + to the K1's as well.

Originally Posted by darsondriss

6. As far as thickness goes they appear to be more or less equal

These are the two tests that will help a ton in comparison. Weight them (gram scale, not a post office scale) and do a submersion test. Depending on metal comp, the weights and volume could be dramatically different (ie, the K1's are probably lighter, but I expect the K1 would displace more water.)

Obviously we won't destroy two of those suckers, but I would also bet the Crower wouldn't snap as quickly when stretched. Max G load on the piston (and thus the rod) is at TDC on the exhaust stroke. I expect that the i beam is stronger in that respect, however I doubt anyone will be pushing a b15 or even b16 crank to the rpms needed to cause rod failure for either of those so it's purely academic/bragging rights at that point right?

One thing to note is Crower has the specs and can custom build any rod for you with those dimensions. If you want a set of forged titanium rods they can hook you up. haha. I don't know about K1.

my K1 rods are being custom made to custom spec for a Destroked QR for 600 bucks a set.................

Originally Posted by pimpsmurf

HUGE difference isn't it. You had the holes lined up perfectly, right? That is a big plus for those K1 rods. I really thought it would have been the other way around (ie, check the shoulders on the 07 rods vs stock rods. huge difference as well.) It's not just how tall they are but how wide the support goes out to the sides. That's a huge difference, although they are certainly both sick rods.

Also backwards from what I expected. I expected the K1 to be wider but I think because of the crower's wider "neck" it can have it's smaller "shoulder" as above. Plus Crower rods are forged are they not?

I bet the side ribbing on the Crowers also play into the slimmer shoulder.

This is a big deal as well. the b15 rod used the same (large) hole on the top of the rod to get oil directly onto the pin but it just comes from environment. Inside of these engines are a torret of oil and at 90* B/A TDC it can catch a good bit of oil in that big ass hole.

The K1 rods are way more modern, just like the b16 rods, which have the oil supplies for the wrist pins coming from the high pressure oil rail. That's definitely a more pro way of doing things. This is a huge + to the K1's as well.

I wonder if the crower design would allow for the oiling holes further down, on the k1 the rod is angled inward vs straight down in Crower's case.

These are the two tests that will help a ton in comparison. Weight them (gram scale, not a post office scale) and do a submersion test. Depending on metal comp, the weights and volume could be dramatically different (ie, the K1's are probably lighter, but I expect the K1 would displace more water.)

Obviously we won't destroy two of those suckers, but I would also bet the Crower wouldn't snap as quickly when stretched. Max G load on the piston (and thus the rod) is at TDC on the exhaust stroke. I expect that the i beam is stronger in that respect, however I doubt anyone will be pushing a b15 or even b16 crank to the rpms needed to cause rod failure for either of those so it's purely academic/bragging rights at that point right?

One thing to note is Crower has the specs and can custom build any rod for you with those dimensions. If you want a set of forged titanium rods they can hook you up. haha. I don't know about K1.

THe postal scale was actually pretty accurate. I was looking at the k1 box(probably should have done that orginally) and it said 527.9 grams

Originally Posted by tstaubly

my K1 rods are being custom made to custom spec for a Destroked QR for 600 bucks a set.................................................................. .................................................. ..........

FIXED. Added a few more periods for you. I never said they didn't. I say I didn't know if they did.

Originally Posted by darsondriss

I bet the side ribbing on the Crowers also play into the slimmer shoulder.

They are just beef right there where the K1 relys on the shoulders. Most power is like 20*ATDC or so right? so those shoulders are super important for holding power.

Originally Posted by darsondriss

I wonder if the crower design would allow for the oiling holes further down, on the k1 the rod is angled inward vs straight down in Crower's case.

I'm confused by what you are talking about.

Originally Posted by darsondriss

THe postal scale was actually pretty accurate. I was looking at the k1 box(probably should have done that orginally) and it said 527.9 grams

sweet. so what is the weight difference? I can't find the damned crower weight anywhere

Originally Posted by pimpsmurf

sweet. so what is the weight difference? I can't find the damned crower weight anywhere

Originally Posted by darsondriss

So K1 rods are actually lighter than 07 rods....

Weights

02-06 rods - 504 grams
07+ rods - 545 grams
k1 rods - 527 grams
crower rods - 585 grams

my k1 box says 3 numbers 529.6 379.5 150.1

My Crowers are 574 grams 406 186 tot rot recip

so what do the second set of numbers mean, if you can possibly break it down for me.

k1 seems to be a bit thicker in the pics

Originally Posted by alex_b13

k1 seems to be a bit thicker in the pics

definitely not.

Originally Posted by pimpsmurf

definitely not.

sorry i mean crower sorry typo i was thinking of the k1s not bad good investment tho

Originally Posted by Scrapin

my k1 box says 3 numbers 529.6 379.5 150.1

total weight, big end weight, little end weight

Originally Posted by Big J

total weight, big end weight, little end weight

thanks man.