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New Hawk owner, pics of my project
08-11-2008, 08:29 AM
#1
Junior Member
Squid
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Join Date: Jul 2008
Posts: 24
New Hawk owner, pics of my project
Hey all,
New lister, thought I'd post some pics of my work in progress for your perusal. Keep in mind this was a $800 Hawk that needed love to come back to any condition. We'll see how it ends up.....
Dan
New lister, thought I'd post some pics of my work in progress for your perusal. Keep in mind this was a $800 Hawk that needed love to come back to any condition. We'll see how it ends up.....
Dan
Last edited by DGR Fab; 08-11-2008 at 08:33 AM. Reason: Wanted to add more. Duh.
08-11-2008, 08:57 AM
#3
Junior Member
Squid
Thread Starter
Join Date: Jul 2008
Posts: 24
Yep, it runs. Going to have to do some serious tuning to get it to run RIGHT due to the super short rear runner. "THEY" say it won't work. We'll see. Under WOT it is a scalded dog, but has some minor teething issues.....
4 degree wheel, raised seat, 2" stainless to 2 Carbon canisters, K&N, jetting still to do. Yes, I know it will may be be a cantankerous hag when it is all said and done, but we'll see...
4 degree wheel, raised seat, 2" stainless to 2 Carbon canisters, K&N, jetting still to do. Yes, I know it will may be be a cantankerous hag when it is all said and done, but we'll see...
08-11-2008, 09:28 AM
#4
Post Whore Junior
MotoGP
Join Date: Nov 2006
Location: Triad, NC
Posts: 4,825
Ever thought of welding a flap inside the rear exhaust header pipe.. sort of like a "choke" to make it "think" the rear header pipe is longer? Make it create more back pressure.. to more equally match the front pipe..
I considered doing exactly what you've done here.. I'll definitely be keeping tabs on this..
I considered doing exactly what you've done here.. I'll definitely be keeping tabs on this..
08-11-2008, 09:31 AM
#5
Junior Member
Squid
Thread Starter
Join Date: Jul 2008
Posts: 24
Funny you mention that. I've been looking at electric cutouts and Vacuum ones too. TOO BIG. A spring loaded flapper would be the ticket. The idle and off throttle response definitely gets better with a coke can sealing off one of the cans.....
Here's some more crap we've done if interested.....
http://www.myspace.com/ttwomp
www.dgrfabrication.com
Here's some more crap we've done if interested.....
http://www.myspace.com/ttwomp
www.dgrfabrication.com
Last edited by DGR Fab; 08-11-2008 at 09:34 AM.
08-11-2008, 10:16 AM
#10
Senior Member
Back Marker
Back Marker
Join Date: Sep 2007
Location: Thousand Oaks, CA
Posts: 103
I like it. I would be very intrested in how your tuning progress goes, as i have a 05 R1 tail on my hawk and have the mufflers mounted the way you do. The only difference is that my mid pipes go around the swing arm like the stock ones do, but i want to do the same thing with the head pipes as you did, but i didn't know how it would run with such a short rear runner.
08-11-2008, 11:16 AM
#11
Post Whore Junior
MotoGP
Join Date: Nov 2006
Location: Triad, NC
Posts: 4,825
Not exactly.. more of a permanent "choke".. I wasnt thinking of a vacuum or electrical operated one.. Just an obstruction welded inside the pipe, to slow the exhaust gas creating back pressure.. One would have to figure out the size of needed though... too big or too little and it wouldnt work..
I'm no engineer though.. this is WAY over my head.. just an idea I had in a dream..
08-11-2008, 03:09 PM
#14
Senior Member
SuperSport
Join Date: May 2008
Location: Bham, AL
Posts: 702
I know the new CBR 1000RR uses some type of valve, not sure if it's electronic or not but it;s cool to see it operate from looking at the tail pipe 
.
I think most liter bikes these days have some type of valveing built into the exhaust to control pressures. Could be wrong.
If I had the geometry of your exhaust I can calculate and run flow analysis of the exhaust and tell you about what length or bends to run to get the desired pressure to match the other side. It's part of my job.
. I think most liter bikes these days have some type of valveing built into the exhaust to control pressures. Could be wrong.
If I had the geometry of your exhaust I can calculate and run flow analysis of the exhaust and tell you about what length or bends to run to get the desired pressure to match the other side. It's part of my job.
08-11-2008, 09:25 PM
#15
Remember stock is BAD!
SuperSport
SuperSport
Join Date: Jun 2004
Location: Jacksonville FL
Posts: 760
The valve in the exhaust has been around for years. Yamaha started using it, (EXUIP) and then there exclusive rights wore out. Now other companies are using a version of it.
At Low RPM the "valve" restricts the exhaust. This creates back pressure, giving the bike more toque. At the higher RPM's this "valve" opens up, creating less back pressure, which is conductive to horse power.
I read some where a long time ago that this valve was linked to throttle position, I am not sure if this is still the case. I would think that engine RPM would / should be the determining factor in this.
At Low RPM the "valve" restricts the exhaust. This creates back pressure, giving the bike more toque. At the higher RPM's this "valve" opens up, creating less back pressure, which is conductive to horse power.
I read some where a long time ago that this valve was linked to throttle position, I am not sure if this is still the case. I would think that engine RPM would / should be the determining factor in this.
12-20-2008, 09:25 PM
#18
Junior Member
Squid
Thread Starter
Join Date: Jul 2008
Posts: 24
SOO...
I've put ~1200 miles on it, and am ready for the next round of mods: Rear end will be redone with 929 swingarm, new exhaust, lowered seat on aluminum subframe, and front is geting GSXR forks. RC51 wheels and brakes front and rear. Might take a while, but....
Anyone have a right side engine case?
Anyone have a right side engine case?
12-21-2008, 03:57 AM
#20
Out of my mind, back in 5
MotoGP
Join Date: Nov 2006
Location: Skurup, Sweden
Posts: 6,109
BTW I missed this thread completely before... I know a little trick to getting that solid obstruction near perfect without doing math... I'm not good a calculating flow...
I just cut a slot on the shorter runner, large enough for a 1,5mm thick piece about the size of the pipe, tight fit, and then pushed that piece in a bit, wrapped it all up in a rag several layers and tried tuning it... A few tries later I got it right and then spot welded the little tab, ground it off and welded it all up...
Might not be 100% perfect, but good enough...
I just cut a slot on the shorter runner, large enough for a 1,5mm thick piece about the size of the pipe, tight fit, and then pushed that piece in a bit, wrapped it all up in a rag several layers and tried tuning it... A few tries later I got it right and then spot welded the little tab, ground it off and welded it all up...
Might not be 100% perfect, but good enough...
12-21-2008, 12:38 PM
#21
Senior Member
Superstock
Join Date: Jun 2008
Location: greeley, co
Posts: 283
I like the under seat exhaust. It reminds me of the old wolf exhaust alittle. I too am thinking about doin a 929 or 954 swingarm swap. Let me know how it goes for you. mods and all. Nice job so far
12-21-2008, 01:15 PM
#22
Junior Member
Squid
Thread Starter
Join Date: Jul 2008
Posts: 24
At the rear exhaust inlet I put a curved diverter to back up the rear cylinders exhaust. Works great after the carbs were sonic cleaned and I had a local shop tune it. NO back pressure, had to set idle ~1500. I'm ok with it. The seat is raised ~1" to clear the exhaust as is. I'm going to have to rebuild the exhaust when the swingarm goes on. The 929 arm is going in at stock length, mainly becaues nobody has actually reported on how this makes the 'Hawk handle. When I do report back (it might be a while) keep in mind that I'm 40 and might like the added stability of a longer wheelbase. We'll see. After that I'll build a stock length swingarm for comparison sake. The bike is fast, and really kind of love feilding the myriad of "What kinda Ducati is that?" questions. I can completely rebuild the exhaust if somebody has need/want for this one. When it goes back together the seat will be lowered, and I might go to a single outlet, well, because I can.
12-21-2008, 06:08 PM
#24
Junior Member
Squid
Thread Starter
Join Date: Jul 2008
Posts: 24
That 510 is one of MANY in the shop. I think that is the reason I like working on the Hawk so much. It's not what I do on a daily basis....Here's my 510....
http://datsun510.com/photopost/showp...puser=170&sl=t
http://datsun510.com/photopost/showp...puser=170&sl=t
12-21-2008, 09:03 PM
#25
Senior Member
MotoGP
Join Date: May 2008
Location: San Clemente, CA
Posts: 3,451
That 510 is one of MANY in the shop. I think that is the reason I like working on the Hawk so much. It's not what I do on a daily basis....Here's my 510....
http://datsun510.com/photopost/showp...puser=170&sl=t
http://datsun510.com/photopost/showp...puser=170&sl=t
The 510 was so advanced for it's time, with independent rear suspension, ohc engine, front disc brakes, and the styling has turned out to be timeless.
Last edited by VTRsurfer; 12-21-2008 at 09:10 PM. Reason: add to post
01-21-2009, 10:53 PM
#27
Junior Member
Squid
Thread Starter
Join Date: Jul 2008
Posts: 24
Progress
OK, so I have measured and searched, and measured again. I have acquired the ball bearings for the captured side of the swingarm, and the Needle bearing for the opposite side should be here on Friday. After that I need to lathe some spacers to center the wheel (using a 954 wheel/tire) and verify alignment of the sprockets. After I verify it all works, I'll post parts, part numbers, lengths, etc.
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