Autumn Newsletter
Lacey Engineering
STAFFORD SHOW
Things have been pretty busy here at a time when it's usually fairly quiet. We are getting prepared as we have decided to attend Stafford Show for the first time as Exhibitors. The Show takes place 17th & 18th October and we will be in the Sandylands Hall on stand S9a near the Ducati Owners Club stand. We will be offering a number of show special discounts so if you are at the show, please do call and see us. We also plan to have a couple of motorcycles on the stand.
If there is anything you would like to order, we would be happy to bring it to the show to save you on postage. We need to know by the end of Wednesday 14th please, either by phone or buy on line at www.laceyengineering.com and choose "Store pickup" for free delivery to Show.
New Products
Following much demand, we have decided to expand the range of products to include tools and some items for Bevel twins and road bikes. There will be a major change on the website before Christmas (all being well!) so watch out for that and tell your friends.
Bikes for Sale - Added recently:
A 900 SS Sold for a customer in 48 Hours! We do get a lot of requests for whole bikes but rather than stock them we offer an advertising option for our customers and charge a small percentage of the selling price.
What have you got to lose - No sale no fee, oh dear does that sound a bit like an Estate agent?
Loyalty Bonus - Reward Voucher
We do appreciate the fact that many of you return time and time again to shop with us so to say thank you we are introducing a loyalty bonus. As from 1st October, a record of your online sales will be kept and every order over £20 will be accumulated (not including Nova products) and when your total spend reaches £500 you will be entitled to a discount voucher for £25.00 (issued quarterly). You don't need to do anything except shop online and leave the rest to us! If you think we have missed anything please feel free to prod us!
A few words from Nigel
Nigel on the GTS in the Picos Europa
Okay so we did take a holiday earlier this year, and took our 1978 900 GTS nearly 3000 miles through France, Spain and into Southern Portugal. How about that for a bus-mans holiday? I had intended to purchase a modern bike for the trip but after numerous test rides failed to find a bike with that certain something (character)! A short ride on a customers Darmah reminded me of what bikes were supposed to be like and shortly after that I found myself the proud owner of this lovely GTS, or as she is affectionately known to us, Black Betty!
Betty is largely original and I resisted the urge to take the engine apart. I concentrated my efforts on basic servicing, brakes, electrics and the essential fitting of luggage racks. Come the start of the holiday there was a slight air of trepidation but this was soon forgotten once the adventure began. I must say I think I enjoyed every mile of this trip 95% of which was on smaller roads. Yes Betty is antiquated and modern bikes could run rings around her, but for a sense of fulfilment and involvement she certainly takes some beating. My appointment at specsavers for an extra pair of rose coloured glasses has already been made!
It more than lived up to my romantic notions where it's more about the journey than the destination and was a great travelling experience with many tales to tell ( too many to mention here) . One of the highlights was meeting up with the Spanish Ducati Club somewhere in the Picos (by accident!) They were really friendly and insisted we join them for their party in Santander - we spent a lovely evening making many new Spanish friends. Paul Smart was their guest of Honour but the way we were treated they made us feel as though we were guests of honour as well.
Betty the GTS, Paul Smart and myself in the Picos
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FREQUENTLY ASKED QUESTION No. 1
One of the most popular questions we are asked is
What oil do you recommend?
I usually recommend Silkolene Comp 4 20/50.
For many years I used and recommended silkolene racelube 40. Racelube oil was available in two grades, 40 and 20/50. These oils were high quality fortified mineral oils which had been specifically designed for use in roller bearing race engines. Some years ago Silkolene decided to discontinue the racelube range, completely discontinuing the 40 grade but continuing to produce the 20/50 rebranding it as Comp 4 20/50. After discussions with the chemist at Silkolene I made the decision to try an engine on the Comp 4 20/50 and after a year of race use the engine was inspected. I subsequently decided to switch all my engines over to the Comp 4 20/50 and after many years of racing I have been more than satisfied with the oil. The engines run very clean and the oil provides good high lift cam lubrication and generally low wear on engine components.
I also recommend and use this oil for road singles.
If you decide to use Comp 4, make sure you use the 20/50 grade as there are other grade oils in the range that may not share the same properties.
Excerpt from Silkolene website:
COMP 4 20W-50
Particularly suitable for use with tuned racing engines or high performance units being used in hot climates. Has excellent high temperature-viscosity characteristics to help protect highly stressed components and maintain consistent oil pressure and shear stability. Also offers excellent ‘stay-in-grade’ performance and long lasting corrosion resistance, even during periods of intermittent use. Suitable for many vintage and classic engines where monograde oils were originally specified. Also ideal for larger air-cooled V-Twin engines and in roller bearing engines.
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Two 350 previously identical pistons, the one on the left has been machined for a lower compression ratio and is still within the parameters listed.
FREQUENTLY ASKED QUESTION No 2
Will your race piston fit straight
out of the box?
The nature of a race engine is such that it is a modified engine with a view to gaining more power. Due to the fact that there will be many different ideas of how to achieve this the race piston has to provide a starting point for tailoring to fit a particular application. Many things like valve sizes, camshafts, combustion chamber modifications and required compression ratio all mean that it is impossible to supply a "one design fits all" sort of piston. Therefore the race piston is supplied with valve pocket diameters to suit the normal size valves that would be used, and a depth of pocket to suit an average race cam. There will normally be enough material to increase the diameter and depth of the valve pocket to suit most race applications. The dome of the piston likewise will have also been left large enough to provide high compression using combustion chambers that have been more severely modified.
A normal part of race engine preparation will involve checking of valve to piston clearances, checking piston to head clearances and compression ratios. It is also of course good practice to do so on a road engine as well.
It is far better to be able to machine/modify a piston to fit than to have a piston that is designed to cover all eventualities.
Some basic parameters
BASIC CLEARANCES AND SPECS
(Its not a secret!)
Inlet valve to piston clearance - 2mm
Exhaust valve to piston clearance -2.5mm
Radial clearance of valves to valve pocket - 1 mm
Minimum thickness of Piston, inlet valve pocket - 4mm
Minimum thickness of Piston, exhaust valve pocket - 4.5mm
Minimum thickness between inlet valve pocket and top ring groove 1.5mm
Minimum thickness of piston crown - 7mm
250/350 Minimum squish - 24 thou ( 0.6mm)
450 Minimum squish - 32 thou ( 0.8mm)
Piston dome to head - 1mm starting at the squish but increasing towards the centre of the chamber
Compression ratio 250 - normally the best you can achieve is 10.5:1
Compression ratio 350 / 450 - maximum 12 : 1
4 South Way Southwell Business Park Portland Dorset DT5 2NL
Callers by appointment only please.
http://www.laceyengineering.com/
ducati@laceyengineering.com



