Rolling Road Dyno Day - John Sleath, Doncaster

garyv8tiger · Post by **garyv8tiger** » Tue Jul 05, 2011 9:10 am

dpuzey wrote:Briefly my 260 cu. in. has a Ebelbrock 500 4 barrel carb, Comp Cams Xtreme Energy (31-324-3) cam, 1.785" inlet valves & 1.465" exhaust valves, screw in rocker studs. The heads had some work done on the ports together with the manifolds. The pistons are from JE and give a 9.7:1 compression ratio. Still has cast iron exhaust manifolds and a 'Tiger' air cleaner.

john loves edelbrocks very easy to jet

michael-king · Post by **michael-king** » Tue Jul 05, 2011 9:44 am

The jet setup on the edelbrocks is much nicer to change quickly than the holleys. Another advantage of the edelbrock is where the top of the carb body comes off, on a holley they are pretty much at the fuel level and tend to leak, the edelbrocks are higher and less prone to fuel weaping.

dpuzey - the setup you have on the 260 sounds really nice.. good combination of modifications: nice cam, more compresion, better breathing in the heads, sensible sized carb. About the only other additions i would be inclined to do are maybe some headers and an electronic igntion setup. With the screw in studs i gather your motor should be safe to about 5500-6000?.. i bet with the solid lifters, high comp that motor has that really nice hard edge SBF sound..

About the only disadvantage in going to roller rockers on a tiger is you loose that great hard edge sound the flat tappet motors have when you rev them. The higher comp in your motor and the setup you have I bet it sounds one of the nicest motors on the dyno.. make sure Tony takes a video of you when they wind the car up

dpuzey · Post by **dpuzey** » Tue Jul 05, 2011 12:02 pm

Thank you , forgot to add it runs a Mallory electronic distributor.

I did think about headers but there is not a lot of room!

Not sure how it sounds as I have only heard it when I have been driving! A friend say she can hear me from the end of the road so I guess it has a distinctive sound, it is running a standard exhaust system.

Dave

gtsmrt · Post by **gtsmrt** » Tue Jul 05, 2011 12:48 pm

Hi Dave,

Sounds like a very nice little package. I previously had an Edelbrock 500 as well... great carby and as mention, very easy to change things. Have you had your car on the Dyno before? I must get mine back on the dyno after a few changes of my own.

Regards, Robin.

tigerguy2 · Post by **tigerguy2** » Tue Jul 05, 2011 6:27 pm

Hi all, I just had a go at searching for dizzy tuning on the forum and didnt come up with a lot. Does everyone know that the ideal mechanical advance is said to be 26 degrees all in at 2300 to 2500 rpm? Setting the initial static advance at about 10 degrees would give you 36 degrees total. These rules of thumb have gotten some discussion (rediscussion) recently over here in the US. Obviously, every engine and stage of mods is different and you can play with the initial advance to fine tune. At least those mechanical advance numbers ought to be a nice initial target if you do not already addressed it for your engine in the past. Thought it worth mentioning even if only as a reminder as you guys plan your rolling road day tuning session. Sounds like it will be a great day. Cheers, Gene

gtsmrt · Post by **gtsmrt** » Wed Jul 06, 2011 10:09 am

Hi Gene,

I upgraded my distributor a little while back and I had a similar question. I spoke to an ignition specialist who told me that the windsor engine's have a total advance of approximately 32 degrees. As you said, it depends upon what state of tune the engine has for your base tune.

Regards, Robin.

tigerguy2 · Post by **tigerguy2** » Wed Jul 06, 2011 8:31 pm

Hi Robin, that pretty well meshs with the info I have picked up. 32 equals 26 mechanical plus 6 initial static. BTW my info is based on work done by Buck Trippel and Jerry Christopherson here in US. Supposedly extensive research by Ford on their SBF family motors zeroed in on the full advance achievement point as well as total advance. Buck as you may well know is a long time major player in Tiger vintage racing in California. Buck recently published an article in the CAT club Tiger Tales about this topic. He was talking about tuning carbs, but made a big point about getting the distributor set up right first!

One of the key problems with a stock distributor is that stock springs delay the full mechanical advance until way past the optimal. That all in rpm point is a very very key parameter. Buck likes 2300 rpm, Jerry likes 2500. Acording to Jerry, springs that are light enough to be adjusted for 2300 can cause timing flutter at idle with some distributors. So If I were going to a dyno day, I would run a plot of my advance curve before I went and try to adjust to full mechanical of 26 all in at 2500 if that has never been done. You can then play with the initial static. Some people say if you can get it to the 10-12 degree range without detonation at higher loaded rpms, that will help wake up the motor at lower rpms. I am assuming people with stock type distributors know how to do that. With MSD's etc it is a lot easier! All of this is surely old news to the racer guys on the forum, but maybe some of it is helpful to us more regular type guys going to a dyno day. Cheers, Gene

gtsmrt · Post by **gtsmrt** » Thu Jul 07, 2011 10:04 am

Hi Gene,

That is some very helpful information for all of us. The only issue that I can see with people setting up their distributor, would be getting the springs and weights correct to achieve that advance curve. Have you done this yourself? (maybe you could put something in the 'tech tips' section). Thanks again for the information.

Regards, Robin.

garyv8tiger · Post by **garyv8tiger** » Thu Jul 07, 2011 9:04 pm

With the very strong interest from the “online” forum members here it has been agreed to run with organising a Rolling Road day at John Sleath. However, to take into account summer holidays over the next few months, allow people sufficient time to prepare their cars and to avoid clashing with other Tiger events the day is scheduled to take place on Saturday 1St October. A full day has been provisionally booked with the tuner in Doncaster.

There will be a choice on the day of opting for a simple “power-pull” which is a case of driving your Tiger onto the rolling road for a dyno reading and that is all (£50), or (if time permits for all attendees on the day) an hourly rate of £70 can be arranged if it turns out that extra work is needed to get the most from your existing setup. This may involve changing jets, adjusting powervalves and optimising your ignition timing, etc. Either way, it is imperative that simple things like HT Leads, coil, points, condenser and plugs, (anything serviceable) – are in tip top shape. No point wasting your money if your Tiger doesn’t have the basics sorted, but am sure as keen enthusiasts we already have such simple things well and truly dealt with.

As we are booking a full day with John Sleath it will be necessary to get your commitment and a holding deposit of £20 will be required to guarantee your place. Numbers will naturally need to be limited, and whilst it will depend on how much time owners will need to see their cars sorted, John Sleath is comfortable with offering the day out to 10 Tigers - this will ensure everybody gets "quality" time on the dyno.

Those who have already expressed a strong interest;

Gary Jackson
Dean McGee
Tony Tomaselli
Dave Puzey
Martin Stowe
Nick Shaw

Initially, the interest has been from the “digital members” via this forum, but the date chosen will also allow for the meet to be published in the next edition of CATS Whiskers or circulated through a club webmail to all members of the club. This in turn, may capture those members who are not direct forum users.

As numbers will be limited to ten Tigers running on the rolling road so if there are any more Tiger owners out there (perhaps lurking) who wants to join in the fun and see if their engines are working at optimum performance then either send me a pm or email: sunbeamtiger@gmail.com Alternatively, if your Tiger is off-road or undergoing restoration but would like to attend the meet it would be good to see a good turnout of STOC members at the event, you never know if sufficient demand it could become a regular feature on the Tiger calendar.

Intention will be for a "fun day" at the tuner so catering will be accommodated for everyone.

Address, instructions, details of the catering and directions of the venue in Doncaster will be circulated nearer the time.

The price first quoted has gone up slightly but this now includes sandwiches and soft drinks ,can i also thank tony tomaselli as he has done most of the work trying to organise this event ,

Tomaselli · Post by **Tomaselli** » Mon Sep 12, 2011 10:18 am

This event will now be postponed until next year, and is likely to take place before Easter (Feb/Mar/Apr)

So do make a mental note if you would like to join us - would be good to get one's Tiger in shape for the new season of events

bigbob · Post by **bigbob** » Wed Dec 14, 2011 4:56 pm

For those that need a rolling road further South, try Austec Racing in Crawley.

Tomaselli · Post by **Tomaselli** » Wed Dec 14, 2011 5:37 pm

See you been polishing your car again bigbob, with all that extra horse power you entering the car in a concours 'standard' class?

bigbob · Post by **bigbob** » Wed Dec 14, 2011 5:44 pm

The lighting was flattering. I came first in the "supercharged" class last time out!

michael-king · Post by **michael-king** » Thu Dec 15, 2011 12:26 am

Bob.. BIG power.. wow.. are the figures raw data or does the readout have corretions fo air temp etc? Normally at the bottom of the dyno dynamics sheets they have what setup it is.. IE: shootout mode (no corrections) or have the temps and humidity etc and % change.

bigbob · Post by **bigbob** » Thu Dec 15, 2011 12:50 am

I believe figures were corrected, as there was weather station attachment. Ran out of time to up boost above 6psi or swing the timing, so more to come yet. Too early to see if the previous 20mpg will now suffer.