The SOHC/4 World Tour is in under way.
0 Members and 3 Guests are viewing this topic.
1204cc - 120rwhp track bike by RPE in OzGood to see front brake still squeaky....https://www.youtube.com/watch?v=0daxpHJcASg
Quote from: hotdog on October 05, 2015, 01:52:38 AM1204cc - 120rwhp track bike by RPE in OzGood to see front brake still squeaky....https://www.youtube.com/watch?v=0daxpHJcASg1204cc is a 78mm bore! How they doing that?
RR, They are claiming to have a stock stroke. That's why I ask the question. 78mm x 63mm x 4 is 1204cc.
RR, They're claiming the 1300 is a stroker. The 1204 claims to be stock stroke on the videos I saw.
Yeah, I know, I only read the second one originally I could ring them and find out, the make their own rods, maybe they made the block..?
+1 on the 1200 with stock stroke and stroker in the 1300.Just buy one of them dammit. One each
Quote from: Retro Rocket on December 08, 2015, 04:57:56 PMYeah, I know, I only read the second one originally I could ring them and find out, the make their own rods, maybe they made the block..?Sure be nice to know. Pretty sure they would have to be spreading the rod spacing to get to 78mm.
As you can understand we are in a delicate position when revealing secrets that costs us a lot of R&D.I can confirm we use offset rods, made in house from billet high strength steel.We heavily modify the stock barrels to suit the pistons (this is the magic part).Race head is also unlike normal cb heads.We can make up to 1300cc on the std stroke. That will be our next race engine to max out P4 rules.
I bet my left testi they're running offset barrel/rods combo, allowing bigger bores.....only need one right.?Sent from my HTC_M9u using Tapatalk
Quote from: hotdog on December 09, 2015, 12:40:07 AMI bet my left testi they're running offset barrel/rods combo, allowing bigger bores.....only need one right.?Sent from my HTC_M9u using TapatalkGday mate, I copied this thread into the Hipo section for the speed freaks... http://forums.sohc4.net/index.php/topic,153581.msg1756028.html#new
.....Heres what they said Keith QuoteAs you can understand we are in a delicate position when revealing secrets that costs us a lot of R&D.I can confirm we use offset rods, made in house from billet high strength steel.We heavily modify the stock barrels to suit the pistons (this is the magic part).Race head is also unlike normal cb heads.We can make up to 1300cc on the std stroke. That will be our next race engine to max out P4 rules.
Quote from: Retro Rocket on December 08, 2015, 11:55:48 PM.....Heres what they said Keith QuoteAs you can understand we are in a delicate position when revealing secrets that costs us a lot of R&D.I can confirm we use offset rods, made in house from billet high strength steel.We heavily modify the stock barrels to suit the pistons (this is the magic part).Race head is also unlike normal cb heads.We can make up to 1300cc on the std stroke. That will be our next race engine to max out P4 rules.Thanks RR. Just as I suspected. Very impressive their engines stand up to road racing in that configuration. Pretty sure they are rearranging the cylinder studs as well. I have studied this setup in my CAD system. It gets crazy!
Yes, I was thinking they would have to rearrange the studs, theres simply not enough room otherwise... What size piston would you need to get 1300cc on stock stroke..?
Quote from: Retro Rocket on December 09, 2015, 02:46:55 PMYes, I was thinking they would have to rearrange the studs, theres simply not enough room otherwise... What size piston would you need to get 1300cc on stock stroke..?81mm x 63mm x 4 = 1298.56cc82mm x 63mm x 4 = 1330.82cc
