Lotus Elan

webber carb conversion stromberg head

PostPost by: wojeepster » Tue Jun 10, 2008 10:20 am

Passage flow control eh? I have that on my toilet and it is able to handle large amounts of well.....crap. I also have what hemmingway refered to as a "shock proof s**t detector" for some reason it seems to be going off now. :shock:
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PostPost by: peterako » Tue Jun 10, 2008 11:28 am

Hi Guys,

as with everything it'll be buyer beware (be aware). As to the claims, well you'll each have to make your own mind up on that matter.

I'm happy with my Big Valve Dell'Orto +2 and it's puny 120 odd bhp.

If [email protected] claims to have this power increase it's up to him and teh buyer to be happy with that.

No need to get persoanl though.....

Beautiful day for a drive!!!

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PostPost by: rgh0 » Tue Jun 10, 2008 11:50 am

Del
By "passage flow control" I presume you have desiamesed the stromberg ports with your add on manifold. In which case around 132hp estimated at the flywheel - not the back wheels is maybe achievable on an unported head at 6500 rpm. If you have ported the head maybe more, however 170hp is ambitious and not really achievable in a 1600cc at 6500 rpm not matter how good you are with 13:1 comp ratio, the best porting, best exhaust(which you cannot fit in an Elan - I've tried) and best cam in the world and certainly not with the specs you list.

I would like to understand the rest of the engine mods - compression, valves, cams ,porting, exhaust header to understand fully the claims.

McCoys Weber conversion of a Stromberg is as understand it US $1350 so at current exchange rates you are looking at similar costs to your estimates. The market for this conversion is mainly in the US where all the Stromberg heads are so that is what your modification will have to compete with commercially.

I support your innovative developments - always good to see someone doing something different but I remain a little sceptical to the details of hp achieved - it is not that easy I think - but then I am always willing to learn something new.

By the way there is no such thing as a 190hp MGB unless its bigger than an overbored - 1860cc the best MGB racers I know get around 170hp at this capacity(unless your talking about special 8 port heads). I would also question 185hp from a FIA Cortina - maybe thats achievable if you rebuild it after every race and have a 9000+ rpm rev limit but it would actually be slower than a 175hp engine with a better torque curve around a track.

cheers
Rohan
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PostPost by: PWTrusty » Tue Jun 10, 2008 12:47 pm

Take pictures, draw it or make it but I want one or two also.
Phil 72 +2s
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PostPost by: elan_fan » Tue Jun 10, 2008 1:23 pm

OK my two peneth

1. I watched the youtube vid (which I enjoyed). You were going well there del but the Cortina was reeling you in at quite a rate. Checking the timing solutions website shows a HSCC roadsports Elan will lap silverstone at 1.42 and a bit. A Cortina will do it in 1.43 and a bit. Silverstone is a very fast circuit so I would say that the Elan would be a bit quicker again at a point a squirt circuit. BS aside 160 is a very good figure for any twincam and the cortina is heavier. 132 at the wheels would be at least 150 at the flywheel and you would have left the B and the cortina for dead.

2. You should be breaking your single dowel on the flywheel at 150 bhp along with the crank.

3. The SE stromberg head is a very good set up having a high CR and D cams so a good carb will definitely work.

4. Whatever the BHP It looks like a quick Elan and that validates your mod but I'm a bit old school for passage flow control. All I know is it's the size of the bangs times the number of bangs per minute and yours aren't big enough....yet.
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PostPost by: robcall » Tue Jun 10, 2008 3:38 pm

Wouldn't there be an increased risk of burnt exhaust valves running a single carb on a twink?
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PostPost by: [email protected] » Tue Jun 10, 2008 4:35 pm

why would the valves have increased risk of burning out , surely thats down to fueling and ignition timming, if its running lean, over advanced ignition timming cheers del
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PostPost by: robcall » Wed Jun 11, 2008 5:03 am

This single carb thing triggered a memory-It was the Mk1 Type 14 Elite Coventry Climax engine which ran a single SU carb that was prone to exhaust valve burn-Lotus changed to twin carbs to prevent this.
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PostPost by: [email protected] » Wed Jun 11, 2008 8:24 am

well with the single su carb on the elite was probably caused buy other issues, , this subject is going to be pulled , ,getting fed up now , with negitive feed back, on this site will persue in other direction
800bhp escort cosworth, 1000bhp nissan skyline , rs200, ,rs 500 ,lotus europa twin cam ,lotus elan s4 rolling road , ecu remaps, powder coating ,like making things that work, do all my own engine work ,worked for cosworth,lotus , porsche, aston martin
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PostPost by: types26/36 » Wed Jun 11, 2008 8:51 am

types26/36/74 wrote:
Can you post the results of the rolling road test :?:


and also some pictures
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PostPost by: rgh0 » Wed Jun 11, 2008 9:52 am

The Elite problems with a single carb were due to poor fuel distribution in the fairly crude manifold used with some cylinders running rich and some running lean and burning valves. Switching to twin carbs enabled a better and more even distribution of fuel / air mixture to each cylinder

Depending on the design of the add on manifold you could face a similar problem with putting a single twin choke carb on the stromberg head but without some photos cant really say.

However looks like we will never know as it appears providing any real data is not going to happen at least on this web site.

cheers
Rohan
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PostPost by: garyeanderson » Wed Jun 11, 2008 10:16 am

[email protected] wrote:well with the single su carb on the elite was probably caused buy other issues, , this subject is going to be pulled , ,getting fed up now , with negitive feed back, on this site will persue in other direction


Maybe you could post photos on your web page. I am sorry that we come off as a bunch of doubting folks, but a track video doesn't get your message across very well. You really need some photos of your installation. You are lucky you didn't put a Elan on Ebay to sell, some people will just pick it to the bone.

Gary
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PostPost by: steveww » Thu Jun 12, 2008 12:50 pm

[email protected] wrote:well guys, if you would go on to you tube, type in knockhill classic speedfair lotus cortina 2008


I loved the clip 8) Your Elan certainly appeared to be holding its own under acceleration. Most of the time you lost was under braking. Looks like you have an issue with the NSR tyre rubbing on the arch.

Sorry to be so negative but you are making big claims with little evidence. Why not just post up some pictures on this site or any other for that matter?

In general BHP gives you top speed and torque gives you acceleration. I can't remember where the quote comes from:

BHP sells cars, torque wins races
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PostPost by: [email protected] » Thu Jun 12, 2008 2:37 pm

thanks for looking , bearing in mind i only finnished the car , on friday before the race , it was converted from concorse road car, which pains the last owner len lacy spent three years rebuilding the car , to which i bought of ebay, and never asked any questions , just banged a bid in at last moment and it was not cheap , got to lenns house in tamworth , well when his wife opened the garage door , i was speechless, the first word i remember saying,., i cant race that , and lenn asked me what i was going to do with it , well the look on his face , when i said im going to race it ,.,.i diegress , anyway back to the car, iwas getting slowly reeled in by the mg, and lous cortina , father and son ,but running standard radiator the temp/ was at 115c, and the brake pedal was nearly on the floor thats what happens when running standard pad , and yes the wheel arches need another buff , 51/2 rims 185-60-13 yokos 048rs tyres , but all said and done the manifold , like mister kipling says, rather tasty and done exceeding well
800bhp escort cosworth, 1000bhp nissan skyline , rs200, ,rs 500 ,lotus europa twin cam ,lotus elan s4 rolling road , ecu remaps, powder coating ,like making things that work, do all my own engine work ,worked for cosworth,lotus , porsche, aston martin
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PostPost by: garyeanderson » Thu Jun 12, 2008 2:46 pm

[email protected] wrote:thanks for looking , bearing in mind i only finnished the car , on friday before the race , it was converted from concorse road car, which pains the last owner len lacy spent three years rebuilding the car , to which i bought of ebay, and never asked any questions , just banged a bid in at last moment and it was not cheap , got to lenns house in tamworth , well when his wife opened the garage door , i was speechless, the first word i remember saying,., i cant race that , and lenn asked me what i was going to do with it , well the look on his face , when i said im going to race it ,.,.i diegress , anyway back to the car, iwas getting slowly reeled in by the mg, and lous cortina , father and son ,but running standard radiator the temp/ was at 115c, and the brake pedal was nearly on the floor thats what happens when running standard pad , and yes the wheel arches need another buff , 51/2 rims 185-60-13 yokos 048rs tyres , but all said and done the manifold , like mister kipling says, rather tasty and done exceeding well


So post the photos, and stop the B.S., we ain't going to steal the Idea. to most, performance is secondary to esthetics anyhow.
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