24 replies to this topic

[gatormark]

We run a class for JK Boxstock with the hawk 7. Needless to say the 7 still has issues. What's a speed comparative that will bolt in these chassis?

[slotcarone]

Try the CR102 From Chicagoland Raceway. Very reliable and fast.

[gatormark]

Is it comparable? Don't want guys running 7 raisin cane.

[Big_John]

IMHO, I've found the CR-102 to have a lot of low end power and it seems very reliable, although I don't have as much time on them as I do the Hawk 7.

 

The low end power can be problematic though. In the experiences the local racers and I have been having, we've found the CR-102 takes quite a different setup with gearing and the cars react much differently and can be harder to drive.  The Hawk 7 is easier to drive. 

 

What we've done is one of our classes have rules that allow Hawk 7, CR-102, Hawk 7 with ball bearings. 

 

The CR-102 seems to do well in a heavier car while the Hawks like a lighter car. A good running Hawk will run about the same as a properly set up CR-102. I've been trying the Hawk 7 BB motors in a couple cars and they seem to be good, but haven't run them enough to really say one way or the other. There doesn't seem to be any huge lap time difference and we've had guys win with each motor.  Without a drastic gear change in the CR-102 cars, a (good running) Hawk 7 will do better and will be easier to drive. 

 

I've taken to running a choke with my CR-102 motored cars... That seems to calm it down to allow for my crappy driving and I turn about the same times as I do with my Hawk 7 cars. 

 

My suggestion is to try the CR-102 in a couple cars...  See if on your track they work well first. Look at your rules too... Do you allow for gear change? These motors are cheap enough to try a couple without breaking the bank, so see what everyone thinks. 

 

But, YMMV. 

[gatormark]

The class calls for 10 36 gearing. The hawk 7s are so inconsistent.

[Big_John]

The class calls for 10 36 gearing. The hawk 7s are so inconsistent.

If you use the CR-102, you may want to rethink that. 

 

The motor is so strong on the low end, that we've found it will pull the flag out of the slot (basically wheelie) coming out of a corner where the car is hooking up well. 

 

As I said, it seems to be a great motor and the power is all in the low end, just have to figure out how to get it down. 

[gatormark]

So many of the FK motors have issues.

[MSwiss]

The class calls for 10 36 gearing. The hawk 7s are so inconsistent.

The CR102 will be slower, geared 10-36, because it has much stronger hard neo mags.

 

Running one with a 10T is pointless. The motor was designed to be put in direct drive drag cars.

 

You'll have to use a 12 or 13, maybe a 14, for comparable speed, and better drivability.

 

With a 15T, it will most likely be faster.

 

Eddie Fleming already proposed a beginner class, and endorsed the CR102 as the best choice.

 

http://slotblog.net/...ing#entry817774
 

[MSwiss]

If you use the CR-102, you may want to rethink that. 

 

The motor is so strong on the low end, that we've found it will pull the flag out of the slot (basically wheelie) coming out of a corner where the car is hooking up well. 

 

As I said, it seems to be a great motor and the power is all in the low end, just have to figure out how to get it down. 

If you aren't going to gear it correctly, please don't use it and be disappointed.

 

I'm pretty sure I've taken the time to explain to you that a much larger pinion needs to be used.

 

Perhaps I am confusing you with someone else, back East.

 

Regardless, you can't "will it" to run the same as a Hawk 7, with the same pinion/gearing.

 

(post has been edited)
 

[Big_John]

If you aren't going to gear it correctly, please don't use it and be disappointed.

 

I'm sure I've taken the time to explain to you that a much larger pinion needs to be used.

 

You can't "will it" to run the same as a Hawk 7, with the same pinion/gearing.
 

 I've been running much larger pinions on the CR-102. When I first tried one, I had nothing about gearing to go by, so, yea, it got geared like the Hawk 7, but a few laps and I was switching gears...  Like everything else, I had to start somewhere. A couple other guys tried the cars with the same gearing as their Hawk 7 and found out really quick. I was ahead of the curve for a week. LOL.    15 works, even have tried 16 with some success.  

[MSwiss]

Glad you got it figured out.

 

I think i confused you without another racer out East, who PM'ed me with the same issue as the the OP, Mark.

[Big_John]

Glad you got it figured out.

 

I think i confused you without another racer out East, who PM'ed me with the same issue as the the OP, Mark.

Nope, that wasn't  me. I know who you are talking about though.

[Eddie Fleming]

I have not tried it so I can't say anything, but some have suggested the Hawk 7 BB. If it is more consistent you could probably keep the same gearing and have about the same performance as a very good Hawk 7 bushing motor.

[gotboostedvr6]

I had success with cr102 geared 17 35 on .730 tire in a UL steel mossetti. 16 was slow and hard to drive 18 was faster but motor was hot

[Highnoon]

Cr102 is not the right motor for wing cars. Retro, dragsters, heavier cars, yes. Try a stage 4, fast and smooth, or if you want a little more a stage 5.

[old & gray]

Our local Friday night races use Hawk  7's in a Flexi chassis gear ratio in unrestricted and people run anywhere from 3.0 to  3.5 with tires from .750 to .790 diameter.

 

Two of the motors I have run completely different ratios one is 9:28  the other runs 8:27. Same lap times, different feel, but same times. If there were still a mandatory gear ratio one (or both) of these motors would be a dog. 

 

I understand mandatory gear ratios but with the current sealed motors this could be driving the issues with the Hawk motors.  

[Ramcatlarry]

We run a flexi DTM class with .700 (dia) tires with 12/34 gearing on the flat track with the MidAm EAGLE.  This is the gear/tire combo that has evolved, not mandated.  If it is geared 10/36 you would need at least .760 tires.  Motors have always been consistent with good brakes.

[gotboostedvr6]

Cr102 is not the right motor for wing cars. Retro, dragsters, heavier cars, yes. Try a stage 4, fast and smooth, or if you want a little more a stage 5.

I imagine the cr102 would be a good wing car motor with 17 36 gear and 750 tire:

To remove the torque you must adjust the gear ratio

[Wizard Of Iz]

I don't race in the Florida Wing Car Series ... but ... I would encourage you to align your motor rules with the rules for the Florida Wing Car Series so that your guys will be ready to race when that series visits your track.

 

Reach out to Jeff Cox.  Or perhaps Ed Hoffman (@Twisted Metal) can let you know what that Series is running.

[gatormark]

Rollin..we are talking box stock .

[snolde]

I have not tried it so I can't say anything, but some have suggested the Hawk 7 BB. If it is more consistent you could probably keep the same gearing and have about the same performance as a very good Hawk 7 bushing motor.

Eddie,

I put a Hawk 7 BB in my JK box stock LMP car to test it at the Atlanta track this past Saturday and ran 5.1 sec lap times with the JK spec gearing. 

IMO JK should offer their Box Stock cars with a motor option, Hawk 7 or Hawk 7 BB.

[snolde]

We run a class for JK Boxstock with the hawk 7. Needless to say the 7 still has issues. What's a speed comparative that will bolt in these chassis?

Try the Hawk 7 Ball Baring. Hawk 7BB

[Hot Slots]

Has anyone used the B52 50k motor? It pulls hard geared 12-36. I don't know if they are consistent or not, I've only see 1 at the track.

[Guy Spaulding]

I recently ran some H7BB motors.  They were more consistent than the H7.  Anyone else experience this?

[MSwiss]

I recently decided to allow them now in our Wednesday night C7/21 only, GTP class, after giving up on the regular Hawk 7.

 

The 3 or so, that have run so far, have all been fine.

 

Probably a tiny bit faster than the bushing Hawk 7's.