Harris Magnum 2 build

[caferacerdan]

Engine out (not a fun job)

Loaded in van to take to my engine man tomorrow

[clivegto]

What's up with the engine @caferacerdan

[Dezza]

Removing the engine from a Magnum 2 is much easier than on a bike with a cradle frame: support the engine well all round, remove the engine mounts, and then lift the frame off of the engine in a slightly forward rotational manner. It's easier if you remove the wheels first (and everything else for that matter) and it's obviously a 2 person job

[caferacerdan]

14 hours ago, Dezza said:

Removing the engine from a Magnum 2 is much easier than on a bike with a cradle frame: support the engine well all round, remove the engine mounts, and then lift the frame off of the engine in a slightly forward rotational manner. It's easier if you remove the wheels first (and everything else for that matter) and it's obviously a 2 person job

thats the plan for next time!

15 hours ago, clivegto said:

What's up with the engine @caferacerdan

smoking like a 70s porn star! dropped it at my engine builder (he builds the Ducati motors for BSB)

it might just be valve stem seals as it was stood 13 years but if rings have gone and bores are scored than 1230cc here i come!

[R1guy]

On 7/23/2020 at 1:47 AM, caferacerdan said:

 

it might just be valve stem seals as it was stood 13 years but if rings have gone and bores are scored than 1230cc here i come!

Let’s be honest- it’s going to end up 1230 at some point, so best do it now, whilst it’s at the engine builders....

This is OSS , so peer pressure is required.

[caferacerdan]

motor is not good...needs new pistons etc

so since its a gsx1100ET motor i am limited to 1168cc bore

Do i go with 1168 or source an EFE block to go on the motor and take it out to 1230?

I am by no means a motor expert so feel free to school me

[buff]

EFE 1230 pistons are 20mm size small ends (et 18mm) , unless someone will do a custom set. If it was me I'd stick with the 1168, i went 1260 and had issues with clutch slip. It could have done with a lock up clutch/spacer , but i was never sure if there was enough room in a mag 2 frame.

Edited August 19, 2020 by buff
more info

[Fazz711]

Stick to 1168.

Been done lots of times. 

Much less hassle 

[clivegto]

Think I may have a EFE block in my stash if you go down that road Dan. 

[caferacerdan]

Building this bike to do top speed on and my goal is 175mph. 

I'm thinking 1168, race cams and 12:1 comp should see me close to 150hp with rs36s...

Which with the harris light weight compared to a stock gsx I think that's doable

[Dezza]

1 hour ago, caferacerdan said:

Building this bike to do top speed on and my goal is 175mph. 

I'm thinking 1168, race cams and 12:1 comp should see me close to 150hp with rs36s...

Which with the harris light weight compared to a stock gsx I think that's doable

You're going to need a fairing

[yantosh]

didn,t Kev go fast with no fairing?

[clivegto]

13 minutes ago, yantosh said:

didn,t Kev go fast with no fairing?

Yes & so did Mr @MeanBean49but with the aid of very big turbo's

[clivegto]

4 hours ago, caferacerdan said:

Building this bike to do top speed on and my goal is 175mph. 

I'm thinking 1168, race cams and 12:1 comp should see me close to 150hp with rs36s...

Which with the harris light weight compared to a stock gsx I think that's doable

Dan you going to use a longer swinging arm or plan on using the one that's fitted. 

[MeanBean49]

5 hours ago, Dezza said:

You're going to need a fairing

Mine was good for over 200 with no fairing, Kearsley did over 200 too. Took nigh on 300bhp tho. And 200bhp ish to see over 175.

200ft lbs of torque at 6k helps quite a bit too. An N/A wont have anywhere near that

Edited August 20, 2020 by MeanBean49

[caferacerdan]

ive got a fairing to go on Ducati 748/916

motor parts bought...13.5:1 compression 1168cc piston kit, web high lift race cams, adjustable cam sprockets etc etc

keeping swingarm as is for now and see how i get on...i dont have to fight the higher speed wheelies or wheelspin as bad as the turbo boys.

[buff]

You'll need a good battery with that compression.

[MeanBean49]

8 hours ago, caferacerdan said:

ive got a fairing to go on Ducati 748/916

motor parts bought...13.5:1 compression 1168cc piston kit, web high lift race cams, adjustable cam sprockets etc etc

keeping swingarm as is for now and see how i get on...i dont have to fight the higher speed wheelies or wheelspin as bad as the turbo boys.

We dont know if we dont try, all part of the fun.

Be interesting to see how you get on.

Look forward to seeing the turbo build next year 

[Dezza]

13 hours ago, MeanBean49 said:

Mine was good for over 200 with no fairing, Kearsley did over 200 too. Took nigh on 300bhp tho. And 200bhp ish to see over 175.

200ft lbs of torque at 6k helps quite a bit too. An N/A wont have anywhere near that

But 200 bhp isn't 150 hp, which seems realistic from a normally aspirated breathed-on GSX engine. The point being to go 175 mph with 150 bhp, my guess is some sort of fairing will be required

Edited August 21, 2020 by Dezza

[Gixer1460]

30 minutes ago, Dezza said:

 The point being to go 175 mph with 150 bhp, my guess is some sort of fairing will be required

Its true - aerodynamics = cheap horsepower! Make what you've got, work harder for you. Doing it naked is manly but if the target is going fastest, then the fastest of the fast tuck everything in, shave every bump off and fill every gap possible. And if you have the room - short swing arms are better than long - it's a gearing / weight transfer thing.

Never been interested in top speed trials but do admire people that do it, and do it well!

[MeanBean49]

1 hour ago, Dezza said:

But 200 bhp isn't 150 hp, which seems realistic from a normally aspirated breathed-on GSX engine. The point being to go 175 mph with 150 bhp, my guess is some sort of fairing will be required

Thats what I was getting at, took me over 200bhp to get over 175mph, and a bucket load of torque unfaired

Also dont think 150 n/a will be enough, good to see someone having a go.

Also expect to see the project evolve to turbo or nitrous in the future to get more power

Edited August 21, 2020 by MeanBean49

[caferacerdan]

I have my turbo slabby for real top speed work and wheelie comps so the turbo bug will be tamed by that for a while!

My good friend Bob Cornforth owns the current record in class at 163mph with no fairings and 145hp on his Triumph Daytona 1200 fighter

If I can match his power with a bit less weight my hope is with the right gearing and a tail wind I can get close

I will get the fairing mounted over the next couple of weeks whilst the motor gets built. 

[MeanBean49]

52 minutes ago, caferacerdan said:

I have my turbo slabby for real top speed work and wheelie comps so the turbo bug will be tamed by that for a while!

My good friend Bob Cornforth owns the current record in class at 163mph with no fairings and 145hp on his Triumph Daytona 1200 fighter

If I can match his power with a bit less weight my hope is with the right gearing and a tail wind I can get close

I will get the fairing mounted over the next couple of weeks whilst the motor gets built. 

I love Bobs Daytona, like following his escapades on the FB pages.

I reckon Bobs record is achievable in the right conditions.

I still want to be the 1st to do 200 at Pendine unfaired. Thats another where I think the conditions need to be perfect

[caferacerdan]

On 8/21/2020 at 6:08 PM, MeanBean49 said:

I love Bobs Daytona, like following his escapades on the FB pages.

I reckon Bobs record is achievable in the right conditions.

I still want to be the 1st to do 200 at Pendine unfaired. Thats another where I think the conditions need to be perfect

yup definitely need a good day and a tailwind but thats my goal!
 

Unfaired at pendine would be a good one to get! Think you go 180+ last time didnt you?

[MeanBean49]

1 hour ago, caferacerdan said:

yup definitely need a good day and a tailwind but thats my goal!
 

Unfaired at pendine would be a good one to get! Think you go 180+ last time didnt you?

178 is my best at Pendine, not had the weather since then to run a long enough course to get close.