Brads Tiger

Mal · Post by **Mal** » Sun Aug 30, 2015 7:54 pm

Brad1380 wrote:What are peoples thoughts on roller virus solid rockers?

If the engine is going to be built to rev a bit I would go with rollers.

Brad1380 · Post by **Brad1380** » Sun Aug 30, 2015 11:33 pm

Thanks Mal,
so far that's 2 voting in favour of rollers.

Tom_HRO260 · Post by **Tom_HRO260** » Mon Aug 31, 2015 3:56 am

Hi Brad

You know my leanings but just by way of a basic comparison (my opinion only)

Hydraulic Camshaft non roller
Pros
Originality
Range of profiles available
Choice of firing orders
Driveablility
Economy
Price
Maintenance (zero lash)
Cons
Lift and duration limits
Lifter pump up (can resolve with anti pump lifters)

Mechanical Flat Tappet non roller
Pros
Period Originality - these were the performance cam of the day
Range of Profiles
Choice of firing orders
Sound! Can't beat that "tack tack tack" of a flat tappet cam
Cons
Lash, lash, lash. Normally I wouldn't care but geez, setting lash in a Tiger? Call me lazy but it's just a pita.
Sound! Where are those rattles coming from??? (ok, I love the rattles but's that's subjective...)
Potential associated costs. Think hardened/chrome moly push rods, maybe roller tip rockers depending on lift, guide plates, studs etc etc

Hydraulic Roller Cam
Pros
Really different ramp angles, more lift, greater duration options
Crisp cam response
Maintenance
Availability
Cons
Firing Order limitation (few early FO avail)
Associated Costs -
will definately need roller followers
may need a bore/ream/hone of lifter bores with the earlier block
distributor drive gear (billet cams need a bronze gear although some composites are available - I've not used latter so can't speak for life span)
valve train
bigger lift may call for roller followers, studs, guide plates
Heads. Yep, not much point having a kick arse cam breathing through tiny lungs...

I'm afraid I have zero experience with mechanical rollers, but I would assume most of those profiles aren't really directed at street driving.

In a nutshell - so long as it's compatible - the hydraulic roller for mine (it's what I use so I have to say that!).

Cheers, Tom

bigbob · Post by **bigbob** » Mon Aug 31, 2015 4:12 pm

I've got roller cam, hydraulic roller followers, aluminium roller rockers & aluminium heads. Seems to work well as a combination. Easy to change drive cog on distributer to suit if required.

Wilbur Bud · Post by **Wilbur Bud** » Mon Aug 31, 2015 6:21 pm

rollers (followers and rockers) allow more performance, and more consistent performance, but just for fun, have you considered Rhoads followers to pair with roller rockers? Rhoads create a primitive type of variable valve timing, which could give more performance for those few times when you keep your foot down.

Yes, a little bit of clickety-clack for normal driving, but a fun technical doo-dad to have inside.

http://www.rhoadslifters.com

Brad1380 · Post by **Brad1380** » Mon Aug 31, 2015 8:06 pm

I continually amazed at what you can do to a Tiger!

Brad1380 · Post by **Brad1380** » Mon Aug 31, 2015 8:07 pm

Has any one tried Thumper cams?

Tom_HRO260 · Post by **Tom_HRO260** » Tue Sep 01, 2015 6:28 am

As in Thumpr the Comp Cams offering?
I'm no expert, but after peeking at the web site they look like they're probably mega duration cams - which equates to choppier idle (as at least one side effect anyway), which is more about how you plop along at the lights...
I'd look at other profiles personally, but it all depends on what you are wanting to achieve. What does your engine man point to? (If you say Thumpr, I'll quietly crawl back under my rock...)
Cheers,
Tom

Brad1380 · Post by **Brad1380** » Mon Sep 14, 2015 10:27 pm

Well almost decided on the spec, Roller rockers are a go as are ali heads, the rest yet to be confirmed.

Brad1380 · Post by **Brad1380** » Fri Sep 25, 2015 8:21 pm

Well had a good talk with John Sleath yesterday, i must admire his honesty & integrity as to what will make a Tiger go down the road well without going over the top unlike some of the engine builders i have spoken with.

Just a couple of things to sort out then we should have the final spec.

Remade the panhard mount, it's a better fit than the magnet makes out, think i may chop the bottom of it off along the blue line as i can't see the off cut making much difference & it looks a bit industrial.

Brad1380 · Post by **Brad1380** » Mon Sep 28, 2015 12:33 pm

Found a bell housing )

Also the clutch pivot arm which looks like someone has taken a grinder to the end of it & another bit on the left which I've no idea what that does.

bigbob · Post by **bigbob** » Mon Sep 28, 2015 3:38 pm

Left hand bit is the mounting for clutch slave cylinder.

Brad1380 · Post by **Brad1380** » Mon Sep 28, 2015 6:47 pm

Thanks Bob,
guess that is why it was with the pivot arm.

Tidied up the bell housing.

and made a start of the Panhard plates, spot welded in place ready for stitching around the outside, i wonder how much it will distort when it cools?

Tomaselli · Post by **Tomaselli** » Tue Sep 29, 2015 8:15 pm

Sleath is indeed your man. He recommended a great roller cam setup for my build. He leans towards Comp Cams as being reliable and from my experience, bloody good value

Managed another 30hp top end whilst increasing torques lower end = win, win!

Brad1380 wrote:Thanks Mal,
so far that's 2 voting in favour of rollers

Brad1380 · Post by **Brad1380** » Thu Oct 01, 2015 8:41 am

Going to have the same cam as you but on a 31 spec grind rather than the 35, so thats a one off special

www.compcams.com/Company/CC/cam-specs/D ... d=897&sb=0

sunbeamtiger.co.uk

Brads Tiger

2 bobs do not a crankshaft balance...