Topic: DIY Egli Sohc 4

[BlindJoe]

Damn that thing is beautiful!

[Terry in Australia]

MEC,
look for a set of stub drills, or srewmachine length..

You are very brave slitting that high off the table.    

I would not even try it, unless clamped closer to the cut..

I have a feeling, looking at these pics of probably the best engineering that I've ever seen on a bike forum anywhere, that he knows what he's doing Frank............

[754]

I have run into gobs of folks that never thought to run stubs on a mill.. a huge timesaver..

 And until you had a slitting saw explode on you cuz of worksuck (taking out your drive pinand alighnment on spindle) & ruined your work, and found pieces of saw for months later.. you wont worry about it that much.

There are 2 kinds of machining people..;
 Ones that know it all...

and ones that keep learning more till the end..  I bet Mec fits into the last group...

[mec]

hello,

thanks for the tip to look for stub drills.
I decided to cut the drills and and I saw this as a good practice on how to sharpen drills.

754 is right: it was a little bit critical slitting that high of the table and I was very carefully, cutting very slow during work.
I remember, I was 8 years old when I learned to ride a bike and work on bikes. these years a lot of practical knowledge accumulated which is (for me) more worthful than all the theoretical stuff learned on universities or from science books 
I´d prefere to know all theoretics as well, however, but you can´t have it all.

mec

[fuzzybutt]

a frame like that would be great with my suzuki titan motor i imagine

[Terry in Australia]

hello,

thanks for the tip to look for stub drills.
I decided to cut the drills and and I saw this as a good practice on how to sharpen drills.

754 is right: it was a little bit critical slitting that high of the table and I was very carefully, cutting very slow during work.
I remember, I was 8 years old when I learned to ride a bike and work on bikes. these years a lot of practical knowledge accumulated which is (for me) more worthful than all the theoretical stuff learned on universities or from science books 
I´d prefere to know all theoretics as well, however, but you can´t have it all.

mec

That's it mate, the fact is that we don't live in a perfect world, and sometimes, due to the restrictions imposed on us by not owning every possible machine that we'd like, we have to make do with what we've got, so we have to (carefully) manage the situation as best we're able, so as to achieve a professional looking end result.

We've all broken a tool and/or wrecked a job at one time or another, that's just part of the learning experience, and as long as we learn from these situations, then they're not a total disaster. Keep going with that wonderful work mate, and continue to proceed with caution! Cheers, Terry.

[voxonda]

That is very well said, Terry!

Cheers, Rob

[mec]

I am getting old............or 1000ccm are not easy to kickstart

better to go this way (good idea NOT to have a locking differential ):

mec

[Ecosse]

Painfully beautiful women are rarely practical.


So I'm told.   

[Jerry Rxman Griffin aka MuthaF'er]

Yes but what happened after it started?

[mec]

Yes but what happened after it started?

it was the day before dynotesting the bike. once the engine woke up, it run fine. I held it in the 3K-4K rpm range, the engine run 30 minutes all together since have been built.

today was dynoday

here we go

we took 3 bikes for testing:
my friend peter´s egli 750sohc with stock engine (marving 4into1 with racing muffler, stock carbs with velocity stacks)
my egli replica 750sohc with modified engine
my ducati

[mec]

1 and a half hour later we arrived at Peter´s shop (another Peter, I will call him Peter2).
Peter2 is a famous tuner and loves to build Guzzi, guzzi, guzzis, and sometimes ducs....
at the entrance a beautifull 4V guzzi said hello and welcome.

in the background the dynojet is waiting.

[mec]

we started our work with the stock engined egli.
I insisted to dyno this bike for comparison only. I was curious what the stock engine is able to do. in addition the comparison between these eglis is what really counts. one dyno is not like the other. I hoped that my 1000ccm engine will give at least 20 or 30 more HPs than the stock engine.

[mec]

Peter2 told us, that his dynojet is a friendly one, often showing slightly more HPs than on other test rigs, because of measuring less rear wheel slap than other test rigs. before measuring the rear wheel was pumped up to 3bar (what we had forgotten to do with the ducati).
it took 5 minutes to warm up the engine and the result was:
Max Power 58.5 rear wheel hp at 8046.2rpm, Torque max 61.2Nm at 4301.4rpm.

the lambda sensor showed that the engine run a little bit on the fat side (main jets too big), a few more ponies are waiting with smaller jets.
we had been surprised because we all thought that this old 1974 engine would perform max 50 HP.

the next was my Duc rr16. this example shows what changed within this 30 years of development. 5-10 minutes engine warm up, water temp over 70°C, incredible noise, the bike was equipped with a racing exhaust, incredible throttle response, the numbers are:
189.3 rear wheel HP! unfortunately due to the fact that it is nearly impossible to measure rpm we do not have a torque curve nor the rpms at max HP.

[mec]

last but not least my replica was tested. with its slightly modified engine we expected a moderate power increase over the oem engine
but all was a little bit different. engine warm up went ok, reving the engine over 6k rpm was problematic. it took not long to find out that the spark plug of cyl 2 was not firing adequately. it was a hassle to change this sh*#racing iridium 9 NGK plug. engine was hot, the frame design was not a help at all, but after two coffees and cooling down the engine we succeeded in exchanging the spark plug to a standard NGK9 plug. so the engine had to run on 3 iridium an one normal plug. but this exchange was a success, because from now on the engine run fine. first run up to 8k rpm and we all knew that we had to rejet the carbs. we went down from main jets 140 to 120, needle position one down. in addition to this we eliminated the exhaust damper and again we started with the next run. yeah, a significant power increase was visible, but all the numbers told us to re-richen the fuel/air mixture, maybe main jets between 120 and 140 are right. again carbs off the engine, reaming the main jets to plus 130, carbs back onto the engine and another run.
this setup was the right one. good hp and more important a really nice smooth torque curve with usefull power from 5500rpm to 9000rpm.

numbers:
max HP at 8865.4rpm
max torque at 7028.9rpm

what are your suggestions?


mec

[benly- ben]

numbers:
max HP at 8865.4rpm
max torque at 7028.9rpm

what are your suggestions?


mec

80-86
 Ben

[benly- ben]

numbers:
max HP at 8865.4rpm
max torque at 7028.9rpm

what are your suggestions?


mec

80-86
 Ben

hmmmmmm... ok   75-86
Ben

[Frankencake]

Suggestions?  I suggest that you have failed miserably and you should ship that bike immediately to my house for proper disposal.  I'll do it for free as a personal favor but you OWE me next time.

[Ecosse]

Suggestions?  I suggest that you have failed miserably and you should ship that bike immediately to my house for proper disposal.  I'll do it for free as a personal favor but you OWE me next time.

If you look back far enough in this thread, I was first to generously offer releasing mec from the agony of ownership.

This could get ugly.


90hp?

[78CB750CAFE]

What was the max HP???

[Jerry Rxman Griffin aka MuthaF'er]

96hp ?
78 ft lb ?

[Terry in Australia]

G'Day Mec, sorry I've been away for a few days and have missed the latest developments, but I'm guessing around 100 BHP at the wheel would have to be about right? More importantly that engine should be really torquey, and with the light weight and your own slim build, the accelleration should be phenominal!

I've just obtained (from another member here, thanks Wayne!) a NOS Egli race fairing and some body work (Dunstall? Rockman? Egli?) that doesn't fit on a my CB750 properly so I'm thinking about using it on my "Tegli" build, do you have an actual plan with measurements etc for your beautiful frame that I could have a look at mate?

Do you think T316 grade annealed AW Stainless steel tube (1.6mm wall thickness) would be OK for the frame, or would it be too brittle? Cheers, Terry.

[Frankencake]

Suggestions?  I suggest that you have failed miserably and you should ship that bike immediately to my house for proper disposal.  I'll do it for free as a personal favor but you OWE me next time.

If you look back far enough in this thread, I was first to generously offer releasing mec from the agony of ownership.

This could get ugly.


90hp?

We're practically neighbors.  We can share the shame of disposal.

[mec]

Suggestions?  I suggest that you have failed miserably and you should ship that bike immediately to my house for proper disposal.  I'll do it for free as a personal favor but you OWE me next time.

and what when you are not able to handle the exorbitant power of that beast?



I hoped that the bike will reach 100hp, but I expectet +/-90hp.

first run on peter2´s dyno was in the range of +97 rear wheel hp. rejetting to 120 main jets and we saw 105hp, again rejetting to 130mj and the dyno result was 113hp at 8865rpm. the last runs had been done without silencer. we stopt and renounced further runs because we were concerned if the dyno was able to withstand this exorbitant power output .......
no....we felt that the engine reached its ceiling.
but best of all, Terry is right, the torque curve with its max of 103.8Nm at 7028.9rpm, the engine delivering usable racing power from 5.5Krpm without any ups or downs.

lamda numbers show that the engine runs a little bit on the rich side in midrange, exactly whats good for quick acceleration out of corners.

some thoughts:
this engine delivers ~exactly double the power of an oem engine. how long?? crankshaft, primary drive, transmission are designed to handle 58hp. everybody can imagine the stress done to these parts. this engine is more a short distance race engine, than for endurance competition.

terry: i will do investigations on your question T316. will take a few days.


pictures show the comparison between the stock engine and my 1000ccm
second pic all three bikes together with a slight power advantage of the rr16

mec

[SteveD CB500F]

Mec: can you scan the dyno charts to jpeg (not pdf) as we have a Gallery of these:

http://gallery.sohc4.net/main.php?g2_itemId=13118