A real formula 3 engine

**Wed Mar 22, 2006 9:40 pm » Post: #1 » Download Post**

Heres the start of something,

HRC MC21 F3 crank cases, HRC F3 crank, HRC pistons, re-worked barrels, HRC F3 head gaskets, remachined heads, HRC F3 ignition.

Just at the measuring volume stage of the build, should have it running in a few weeks

_________________
If I have to take the carbs off once more...

**Wed Mar 22, 2006 10:29 pm » Post: #2 » Download Post**

Now that is very nice Cool

,which bike is that going in then? Wink

**Wed Mar 22, 2006 11:12 pm » Post: #3 » Download Post**

Well, it is only an F3 motor, and therefore eligible for F250... Wink

_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

**Wed Mar 22, 2006 11:21 pm » Post: #4 » Download Post**

Yeah Its only an HRC F3 motor so it can run in F250 up againest all them RVG things or what ever they are called. Who knows what chassis it will end up in!! Wink

_________________
If I have to take the carbs off once more...

**Thu Mar 23, 2006 12:08 am » Post: #5 » Download Post**

Now dem dare HRC piston thingys.....they wouldn't happen to be the single ring variaty that Leigh was talking about last week......?

**Thu Mar 23, 2006 12:35 am » Post: #6 » Download Post**

Er, no... cos those are fitted to an HRC crank!! Very Happy

Leigh's are from another manufacturer - most likely Suzuki or Kawasaki.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

**Thu Mar 23, 2006 2:39 am » Post: #7 » Download Post**

Pssst...Steve....you've gotta put a gearbox in it before it'll go. F3 perchance?

**Thu Mar 23, 2006 7:56 am » Post: #8 » Download Post**

ohh damn it. Thanks Matt, I thought it was light.

The only F3 gear box I know of is now in Andys bike so no, I think I will just end up using a stock box out of a '21.
_________________
If I have to take the carbs off once more...

**Thu Mar 23, 2006 9:45 am » Post: #9 » Download Post**

where are you finding all this stuff.

dont tell me its another secret Rolling Eyes

_________________
MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

**Thu Mar 23, 2006 4:30 pm » Post: #10 » Download Post**

I think it very similar as HONDA 1992 RS250 engine....some of parts are same??
_________________
1996 HONDA RS250
1995 MC28 NSR250 SE red/white/green
1994 MC28 NSR250 sp W/ RS250 engine

**Thu Mar 23, 2006 5:46 pm » Post: #11 » Download Post**

Lots of research, lots of string pulling! Smile

Mmm... HRC F3 carbs... No 2T unions, no TPS, no remote idle adjuster... Very Happy

Ooh, it's gonna be a flier!!
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

**Sat Mar 25, 2006 1:06 pm » Post: #12 » Download Post**

The latest update is the top end is now complete and built up, just got to sort the transmission out.
_________________
If I have to take the carbs off once more...

**Sat Mar 25, 2006 3:42 pm » Post: #13 » Download Post**

Hmm... I'm interested to know what the score is with running no TPS... How does that affect the ignition? Is it becaus you don't need it with the HRC loom? If so, I might go that way, because mine was a pain to set up with the 38's due to their lack of sensor mount also...
_________________
NSR300R - Why did i ever have a 250...

**Sat Mar 25, 2006 5:48 pm » Post: #14 » Download Post**

Yes it uses a HRC loom but it also uses a HRC PGM with no TPS so its not just a case of running a HRC harness. The HRC loom is also designed to work with the HRC reg rec and pick ups etc.

How did you manage to set your tps up in the end maxim? I did a whole load of runs to find the best with some very interesting results.
_________________
If I have to take the carbs off once more...

**Sat Mar 25, 2006 7:34 pm » Post: #15 » Download Post**

Yeah, like you it was probably twist and see! The 1st run, I think it made 12bhp... Laughing

Then another, it had a Grand Canyon flat spot at about 7000, making about 6bhp, then in the space of about 200rpm, jumped up to about 50ish!

So how does the HRC PGM and loom combo affect or supplement what the TPS used to do? I know of a PGM I think, and also an HRC loom... It runs fine at the moment anyway, but I don't have it on the road anymore, so I may as well ditch the standard loom and lights etc and put the spindly HRC one on!

I'm still not sure it's set at maximum properly... But it was as good as we could get it.
_________________
NSR300R - Why did i ever have a 250...