Built engine & motor mods? - Wrist Twisters
 
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post #1 of 29 Old 04-06-2012, 05:56 AM Thread Starter
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Built engine & motor mods?

Okay so I am planning for next winters projects already.

I have a spare CB919 engine sitting on the bench that I was thinking about playing around with. I have been researching building a turbo kit, I have a few TD04 wrx turbos on hand from previous rally-x projects. Now aside from the obvious boosted solutions, are there any other motor mods that can be done. I plan on pulling the head and doing a P&P on it, maybe new pistons and cams?
Whatever i do I want to be able to convert back to my other OEM motor/setup if & when necessary.

Any input or advice is invited?

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post #2 of 29 Old 04-06-2012, 07:54 AM
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you will want to talk to bucky.... worlds fastest 919.

runnin on some juice... bored, with 900rr cams.... i wanna say around a 945ish cc.... dont think he made much more power tho off juice.

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post #3 of 29 Old 04-06-2012, 01:28 PM
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Quote:
Originally Posted by HeliMech View Post
I have a spare CB919 engine sitting on the bench that I was thinking about playing around with. I have been researching building a turbo kit, I have a few TD04 wrx turbos on hand from previous rally-x projects. Now aside from the obvious boosted solutions, are there any other motor mods that can be done. I plan on pulling the head and doing a P&P on it, maybe new pistons and cams...
Are you planning on dropping compression to give scope for more boost, or is it more a low-blow you are thinking of?

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post #4 of 29 Old 04-06-2012, 02:48 PM
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I'd plan on forged pistons, heavily change fuel delivery, and install large head bolts to maintain integrity of the head gasket.

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post #5 of 29 Old 04-06-2012, 03:09 PM Thread Starter
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Originally Posted by XRCajun View Post
I'd plan on forged pistons, heavily change fuel delivery, and install large head bolts to maintain integrity of the head gasket.

XR is your turbo setup a DIY or one of the WAVE kits? What are the specs on your system and setup? Got a link to share with all the info?

If I do boost the motor I will be trying to source lower comp pistons, also running a fuel pressure regulator and walbro 255 in tank for fueling.

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post #6 of 29 Old 04-06-2012, 03:24 PM
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It's Wave but I made some changes to it. If you're not planning to go above 10lbs boost then I don't think you need the regulator and pump. I did use a PCIII, Ignition Module, MAP sensor to add gas under boost and retard timing. I went with lower compression forged pistons but I'm still having problems blowing pressure past the head gasket so I'm going with a thick gasket and hopefully stronger bolts if I can find them.

Here's some links of discussions we've had on here and there may be more.
https://www.wristtwisters.com/forums/...ase-28130.html
https://www.wristtwisters.com/forums/...elp-25860.html

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post #7 of 29 Old 04-06-2012, 03:28 PM
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edit: lol xr beat me to it and provided more info.

Xr, how much boost you pushing through now?

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post #8 of 29 Old 04-06-2012, 03:45 PM
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lets put it this way... if you like your 919, dont try and go making tons of power out of it .... cus it doesnt happen cheaply, reliably and in a quick fashion.

Not to down the people who have modded the 919 with turbo / juice... but typically they are purpose built rigs etc etc.

If your looking for power in a naked form... just buy a gsxr 1000 or some other 1000cc sport bike n strip the fairings add on some dirbike bars and a tripple tree mounted headlight assembly.... ull have a much more reliable ride, with similar ergos, that has more power... all for less than it would take to mod the 9er.

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post #9 of 29 Old 04-06-2012, 04:44 PM
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Quote:
Originally Posted by nd4spdbh View Post
lets put it this way... if you like your 919, dont try and go making tons of power out of it .... cus it doesnt happen cheaply, reliably and in a quick fashion.

Not to down the people who have modded the 919 with turbo / juice... but typically they are purpose built rigs etc etc.

If your looking for power in a naked form... just buy a gsxr 1000 or some other 1000cc sport bike n strip the fairings add on some dirbike bars and a tripple tree mounted headlight assembly.... ull have a much more reliable ride, with similar ergos, that has more power... all for less than it would take to mod the 9er.
nd4 I'm sorry ma but this has been said quite a few times before. He already said he's got an extra motor and he wants to boost it up. Now why would he go buy a bike that he doesn't like that will look like a wrecked bike when he gets through tearing it apart and it wont be as comfortable.

It's pretty obvious he want the style bike he has (so do I) but would like to tinker with the power.

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post #10 of 29 Old 04-06-2012, 05:08 PM Thread Starter
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The biggest draw for me is that I am a tinkerer. It is the mechanically victory I am after not the speed really, I know that might seem strange.

I currently have a aircooled VW westfalia camper in the driveway that is getting a EG33 engine swap. The EG33 = Subaru SVX H-6 water cooled engine 230hp/230tq.

I enjoy building not buying, it was the way I was raised. My family is full of cheap mechanically inclined bastards.

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post #11 of 29 Old 04-06-2012, 05:14 PM Thread Starter
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Back on topic......

XR where did you get the pistons? Are they 1st OS or just stock?

I think I will start tearing the motor down pull a head stud this and spec it for ARP, they must have something workable. Might as well start getting familiar with the inner working of this thing.

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post #12 of 29 Old 04-06-2012, 05:49 PM
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Quote:
Originally Posted by HeliMech View Post
Back on topic......

XR where did you get the pistons? Are they 1st OS or just stock?

I think I will start tearing the motor down pull a head stud this and spec it for ARP, they must have something workable. Might as well start getting familiar with the inner working of this thing.
The pistons are from J&E Bill over at Wave had them designed specifically for this purpose. I want to say the are around 10.25:1

Well look hang on we just sent a CAD drawing and specs to ARP today for the head studs. I've been searching for months to see if I could find to stronger bolt in the same size but no dice. So we're going to try to get them to one off a set if possible. We may need to have them build more than we need to get them for a decent price.

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post #13 of 29 Old 04-06-2012, 06:22 PM
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post #14 of 29 Old 04-06-2012, 06:49 PM
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Quote:
Originally Posted by XRCajun View Post
nd4 I'm sorry ma but this has been said quite a few times before. He already said he's got an extra motor and he wants to boost it up. Now why would he go buy a bike that he doesn't like that will look like a wrecked bike when he gets through tearing it apart and it wont be as comfortable.

It's pretty obvious he want the style bike he has (so do I) but would like to tinker with the power.
no i understand completely.

Alls im saying is, that its not easy to coax extra power out of the 9er motor. Yes you can turbo it... but that obviously brings in its own realm of problems etc etc. If you have the extra motor and want a test / challenge by all means dont let me stop you OP... but be prepared for many more hours of tinkering than riding.


and my god 230 hp in a fuggin old vw bus! THAT SOUNDS AWESOME!

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post #15 of 29 Old 04-06-2012, 07:32 PM
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Quote:
Originally Posted by Stutz View Post
With the stock suspension I would not want to add more than
15 or 20 hp.
I think I'd have to agree with this statement. I can still remember what it felt like with stock suspension and that was no feeling of control.

Quote:
Originally Posted by nd4spdbh View Post
no i understand completely.

Alls im saying is, that its not easy to coax extra power out of the 9er motor. Yes you can turbo it... but that obviously brings in its own realm of problems etc etc. If you have the extra motor and want a test / challenge by all means dont let me stop you OP... but be prepared for many more hours of tinkering than riding.
There's some truth to this but not entirely. I could still be riding my bike now if I didn't just love tinkering with it and making it better. Seriously that is half for the fun for me. I've been able to ride a lot and now I just like improving what I've got and riding what I'm familiar with.

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post #16 of 29 Old 04-06-2012, 10:16 PM
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Supercharge it.

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post #17 of 29 Old 04-06-2012, 10:28 PM
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Quote:
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I enjoy building not buying, it was the way I was raised. My family is full of cheap mechanically inclined bastards.
Love it!!

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post #18 of 29 Old 04-07-2012, 05:28 AM
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Whats the difference in the two 919cc motors the one in the CB900F and the 900RR

Current
2006 Honda CB900F 919 Hornet
Sold
1996 Suzuki GSF750 Kan.of.tuna
1985 Honda VF700 Intercepter
1997 Suzuki DR650
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post #19 of 29 Old 04-07-2012, 08:14 AM
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I think its:
Pistons, rods, crank, cams, intake (carb vs fi), mounting holes
It's on here somewhere if you search I think.

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post #20 of 29 Old 04-07-2012, 04:15 PM
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Supercharge it.
I thought the flapper mod did that

dont need a bike to ride the fast lane
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post #21 of 29 Old 04-07-2012, 06:17 PM
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DON'T put in replacement ARP fasteners and torque them to the fastener spec with moly-di on the threads.
I leave you imagine the outcome of a such a fitted Level 10 fastener in a Level 1 threaded 919 engine hole.

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post #22 of 29 Old 04-07-2012, 06:20 PM
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will a 900rr engine fit in the cb919 frame?

Arte et Marte
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post #23 of 29 Old 04-07-2012, 06:31 PM
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Quote:
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will a 900rr engine fit in the cb919 frame?
different mounting points. I wonder if cbr head could fit the 9er

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post #24 of 29 Old 04-07-2012, 06:34 PM
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Quote:
Originally Posted by ariannasdaddy View Post
will a 900rr engine fit in the cb919 frame?
not sure. i know the 900rr (919rr) was carburated... and as such doesn't have the pickups for the cam pulse generator.

They do use the same vales however.

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post #25 of 29 Old 04-07-2012, 07:34 PM
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Quote:
Originally Posted by mcromo44 View Post
DON'T put in replacement ARP fasteners and torque them to the fastener spec with moly-di on the threads.
I leave you imagine the outcome of a such a fitted Level 10 fastener in a Level 1 threaded 919 engine hole.
Good tip there Mcromo!

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post #26 of 29 Old 04-08-2012, 06:10 PM Thread Starter
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So I was bored in the garage watching hockey last night. I decided to strip my extra engine down. Mainly because it has a broken aft-lower mount that needs to be welded and the majority of the covers were busted or missing. Add a few beers into this equation and in a surprising short amount of time you get this .....







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post #27 of 29 Old 07-11-2012, 12:42 PM
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Anything happen with this lately?

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post #28 of 29 Old 08-19-2012, 11:17 AM
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He sold the tranny and head so...?

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post #29 of 29 Old 08-19-2012, 11:33 AM Thread Starter
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Quote:
Originally Posted by HeliMech View Post
I currently have a aircooled VW westfalia camper in the driveway that is getting a EG33 engine swap. The EG33 = Subaru SVX H-6 water cooled engine 230hp/230tq.
Quote:
Originally Posted by nd4spdbh View Post
.... my god 230 hp in a fuggin old vw bus! THAT SOUNDS AWESOME!
This project has gone wide open and is demanding my complete attention. The van is now stripped to a bare rolling shell. Doing a full body job then respray hopefully before the summer ends.

I decided to step back off the idea of boosting the 919.........for now.

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