Author Topic: S&S big bore project (Read 5617 times)

Gremlinsteve · **on:** June 25, 2020, 01:03:35 am

Starting to get the parts in

Pictures show the big big kit. Liners the pistons copper head gasket and the air filter
I also have the cam and other small assorted items

The new cyl head is on its way. I will be doing some chamber work that will include welding to get around 12:1 compression.
The heads will be fully ported also

I also have two tbody manifolds that I will port

Gremlinsteve · **Reply #1 on:** June 25, 2020, 01:06:15 am

Gremlinsteve · **Reply #2 on:** June 25, 2020, 01:07:11 am

Gremlinsteve · **Reply #3 on:** June 25, 2020, 01:07:46 am

Camshaft

olhogrider · **Reply #4 on:** June 25, 2020, 01:11:40 am

Sorry if you have already answered this but how will you adjust the fuel/air mixture to compensate for the added flow?

Gremlinsteve · **Reply #5 on:** June 25, 2020, 01:15:26 am

Power commander
Is available
So I’ll have my local stealership dyno tune it

Gremlinsteve · **Reply #6 on:** June 27, 2020, 08:22:00 am

Ordered my clutch kit today along with the power commander

The cyl head is on its way along with the cyl jugs.

I figured I’d start with new parts and have extra stuff laying around I can then sell off to anyone interested in doing these type of mods

As a side note I found a set of 36 and 40mm throttle bodies. Built for the enfield s. Sold by revelry cycle in Australia

Heavy Duty Mick · **Reply #7 on:** June 27, 2020, 02:31:52 pm

It appears that we’re on a very similar journey.

Will be interesting to see how they both end up.

Heavy Duty Mick · **Reply #8 on:** June 30, 2020, 05:30:41 am

I have now ridden an 865 with ported head, S&S cam, and bigger throttle bodies. One word: WOW!

Gremlinsteve · **Reply #9 on:** June 30, 2020, 06:43:44 am

Oh really
That’s interesting. Tell us more

Heavy Duty Mick · **Reply #10 on:** June 30, 2020, 06:58:03 am

Sworn to secrecy regarding details.

But ...

The S&S Cycle 865cc kit, camshaft and other secret stuff combine to make an Interceptor that wheelstands off the throttle!

Gremlinsteve · **Reply #11 on:** June 30, 2020, 07:45:25 am

Doh!!!

I’m gearing up for mine. I’ll be posting pics soon

Jako · **Reply #12 on:** June 30, 2020, 09:34:52 am

Heavy Duty Mick , Was it Santina's bike you rode ?

Heavy Duty Mick · **Reply #13 on:** June 30, 2020, 12:50:54 pm

No. I believe it’s Will’s Bike that I rode.

Gremlinsteve · **Reply #14 on:** June 30, 2020, 04:59:53 pm

Dang. No video of them running?

Heavy Duty Mick · **Reply #15 on:** July 01, 2020, 02:26:56 pm

Quote from: Gremlinsteve on June 30, 2020, 04:59:53 pm

Dang. No video of them running?

No pics yet. No video, either. 🤐

Starpeve · **Reply #16 on:** July 02, 2020, 01:01:34 pm

It’s a complicated game isn’t it? How far over square can you go before you kill the allure of the design?
It’s an engineering maxim that a square 500 cc four stroke motor conventionally aspirated is the ultimate power per cc engine form. Too far either way from this has a whole series of pros and cons. On the one end you have rev stresses and the other you have crank stresses. I put a lot of money/ work into a Yam SR500 with unbelievable results. Beat the crap out of most bikes I contested. A serious performer. An un-counterbalanced engine that revved hard to 8 1/2- 9000 revs. Power everywhere. I stuck it into a truck otherwise I’d still be riding it. No lie, I used to knock off RGV 250 suzies. It was great to see the disbelief on their faces.😂

radiodelete · **Reply #17 on:** July 02, 2020, 03:09:58 pm

Quote from: Gremlinsteve on June 27, 2020, 08:22:00 am

The cyl head is on its way along with the cyl jugs.

Could you please post a photo of the combustion chamber and another of one of the intake ports ?

The quench area and port design is of much interest to me.

Jako · **Reply #18 on:** July 03, 2020, 10:33:28 pm

https://m.facebook.com/story.php?story_fbid=2379147519050579&id=1506632882968718

NVDucati · **Reply #19 on:** July 03, 2020, 10:46:49 pm

Quote from: Jako on July 03, 2020, 10:33:28 pm

https://m.facebook.com/story.php?story_fbid=2379147519050579&id=1506632882968718

Is whatever it is available other than FaceBook?

Jako · **Reply #20 on:** July 04, 2020, 12:05:02 am

Quote from: NVDucati on July 03, 2020, 10:46:49 pm

Is whatever it is available other than FaceBook?

Sorry I can't find it anywhere other then FB. It's Will from Revelry Cycles in Sydney Showing off his custom Interceptor 865 with 40mm throttle bodies, custom head, S&S cam, ect ect ect. he explains it as a fire breathing wheelie popping tire smoking monster.

Gremlinsteve · **Reply #21 on:** July 04, 2020, 01:18:35 am

I will for sure post pics. I’m waiting for the head to arrive along with the cyl barrel
Once there in I’m elbow deep into this

gizzo · **Reply #22 on:** July 04, 2020, 01:40:14 am

Quote from: Heavy Duty Mick on June 30, 2020, 06:58:03 am

The S&S Cycle 865cc kit, camshaft and other secret stuff combine to make an Interceptor that wheelstands off the throttle!

ace.cafe · **Reply #23 on:** July 04, 2020, 01:09:56 pm

I would be interested to see the flow bench chart, along with the head pics.

Don't know if you are aware, but I am well known on this website for about 10 years, and I have done a lot of performance work primarily on the Enfield singles for street and track. I have enjoyed the singles, but really am mostly out of it now, and don't have an eye on the twins.
However, I am interested to see what people are doing with it.

Regarding custom heads, here is what we make for the 535 EFI single. All billet with my entirely new performance design, and keeping as similar of an external look to the OEM as reasonably possible.

Our kit doubles the factory stock horsepower of the 535 Continental GT single.

Cheers!

Gremlinsteve · **Reply #24 on:** August 07, 2020, 08:01:10 am

Quick update for those interested

The new cyl barrels arrived. So off to the machine shop to have them bored and the new liners installed

Warwick · **Reply #25 on:** August 07, 2020, 09:04:18 am

Cant wait for more details on the result. I may be tempted to do the same!!
cheers and beers
Warwick

Heavy Duty Mick · **Reply #26 on:** August 07, 2020, 12:38:18 pm

Quote from: Gremlinsteve on August 07, 2020, 08:01:10 am

Quick update for those interested

The new cyl barrels arrived. So off to the machine shop to have them bored and the new liners installed

I watched Will’s Scram being tuned on the dyno. Impressive. Huge gains over my 50hp. Looking forward to taking mine to 865.

Marcsen · **Reply #27 on:** August 10, 2020, 08:56:11 pm

just found this one online.

https://youtu.be/Rfvx4t4o1cA

only 10 HP seems odd to me , but he doesnt show the dyno sheet, so you dont know the full curve

Gremlinsteve · **Reply #28 on:** August 15, 2020, 11:08:27 pm

Today I received the new head
It’s a stock replacement head. I’ll be porting it along with some trick welding in the chamber I think to raise the compression a touch

I’ll post some pics tonight

ace.cafe · **Reply #29 on:** August 15, 2020, 11:46:40 pm

Looking forward to it!

Gremlinsteve · **Reply #30 on:** August 17, 2020, 10:56:52 pm

Starpeve · **Reply #31 on:** August 18, 2020, 07:58:25 am

Quote from: Gremlinsteve on August 17, 2020, 10:56:52 pm

Pics

Just out of curiosity, what’s the bore/ stroke now. That’d be an ultra short stroke motor wouldn’t it?

Greytop · **Reply #32 on:** August 18, 2020, 11:04:21 am

Quote from: Gremlinsteve on August 17, 2020, 10:56:52 pm

Pics

Looking good. What's the next milestone?

Quote from: Starpeve on August 18, 2020, 07:58:25 am

Just out of curiosity, what’s the bore/ stroke now. That’d be an ultra short stroke motor wouldn’t it?

I think Gremlinsteve was going for the 865cc kit, in which case it will be 90 x 67.8mm up from 78 x 67.8mm.

ace.cafe · **Reply #33 on:** August 18, 2020, 01:29:48 pm

Looks like the factory left plenty of room for improvement.
How many degrees are the valve angle inclination?

Gremlinsteve · **Reply #34 on:** August 18, 2020, 06:59:35 pm

I’ll have to measure the angles