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311 postsShowing posts 161-200 of 311

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

Steve, Nice looking diff, but... have you ever autocrossed a lightweight car with a limited slip differential? 1) Limited slip under power will tend to ...   02-07-2016 06:10 am

Carburetors > Dellorto DHLA 45 (7 replies - 5620 views)

Matthew Cooper (Matt) at Eurocarb Ltd is a great tech resource for Dellortos (and Webers). He knows it all, and is willing to ...   12-01-2015 06:12 pm

Carburetors > Dellorto DHLA 45 (7 replies - 5620 views)

Koit, If you were talking about a Lotus 907/ 912 engine, there's enough Dellorto history with those engines, both Jensen-Healey and Lotus versions, that we could ...   12-01-2015 04:52 pm

Carburetors > Dellorto DHLA 45 (7 replies - 5620 views)

Carbs require a little black art to tune them. They are not ECU controlled with sensors and feedback loops, so it's not a ...   11-28-2015 04:33 am

Carburetors > Dellorto DHLA 45 (7 replies - 5620 views)

In the engine's stock configuration, at what rpm did peak power occur? Regards, Tim Engel ...   11-28-2015 12:29 am

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

Exhaust Manifold Gasket (between exhaust manifold flange & cylinder head) Original thru 1985 Steel-Asbestos-Steel Sandwich: A907E0004Z = JH 97263 - Martin Robey JH Parts Manual A907E0004ZC - 907 thru ...   11-27-2015 11:52 pm

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

While I'm on a roll, here's one more thing... The original steel-asbestos-steel exhaust gasket blows too easily (the ones between the exhaust manifold flange and the ...   11-27-2015 09:00 pm

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

Steve, The current head gasket is the Goetze composite gasket (or JAE sells their own aftermarket clone). It requires the use of either Lotus' ...   11-27-2015 08:41 pm

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

Steve, The number cast into a Lotus part is the raw casting number, not the finished part as used on the engine, or that you could ...   11-27-2015 07:25 pm

Engine & Transmission > Fastner Sizes - Nuts & Bolts (4 replies - 2272 views)

Jim, Is the latest file available somewhere? Regards, Tim Engel ...   11-19-2015 05:43 pm

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

stevegarnjobst wrote: Not sure that conversion is allowable under the SCCA rules. If it were, is the update worthwhile?Yes. The round-tooth HTD timing ...   11-18-2015 04:59 pm

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

stevegarnjobst wrote: Were all the stock tappets cast iron?ALL 907s were originally built with chilled cast iron tappets. When Lotus made the change to ...   11-18-2015 04:47 pm

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

Steve, I just edited Post #19 to add a cylinder head torque spec. If it wasn't there when you read it, go read it ...   11-18-2015 03:33 pm

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

The current composite cylinder head gasket's crushed thickness is 0.020" thicker than the old steel-asbestos-steel gasket's. That lifts the head 0.020" higher off ...   11-18-2015 03:19 pm

Projects > 19064 - autocross project car for SCCA's FSP class (42 replies - 15785 views)

Steve, The very early 907 Mk I intake ports were 24.5 mm tall. Later, they were increased to 25.5 mm as a running change. ...   11-18-2015 03:10 pm

Engine & Transmission > removing cylinder head (10 replies - 5727 views)

Jay wrote: Would anyone have a suggestion on where I could find a workshop manual for the 1974 Lotus 907 engine? I would love to read ...   11-17-2015 10:04 pm

Carburetors > Pierce intake manifold for Weber/Dellorto? (3 replies - 2669 views)

That could be cool. I've talked with Mike, but have never met him in person. He's a good guy, and seriously into ...   11-17-2015 09:45 pm

Engine & Transmission > Internal Oil Breather Pipe (3 replies - 2138 views)

Carl, Vent Pipe: It's used in the 2.0 907 in the Elite, Eclat & Esprit. It is not in the 2.2 912 or 910 Lotus hasn't made new ...   11-17-2015 04:59 am

Engine & Transmission > Crankshaft (12 replies - 10683 views)

Don, I've got 4 new ones, measured them with a micrometer, and got an average of 0.0925" (2.35mm) Lotus = Standard, +0.0025, +0.0050, +0.0075, +0.0100 JAE stocks ...   11-17-2015 03:44 am

Carburetors > Pierce intake manifold for Weber/Dellorto? (3 replies - 2669 views)

Steve, The manifolds (5 available) being offered by Pierce are original NOS parts, not reproductions. The only thing is that, from the photos posted, ...   11-17-2015 03:28 am

Engine & Transmission > Fastner Sizes - Nuts & Bolts (4 replies - 2272 views)

Go to my Dropbox account here: https://www.dropbox.com/sh/4kxqw9vlsnz54lf/AACCyvB-TfYKLI1qM-e_IUlTa?dl=0 In a sub-folder titled "Jensen-Healey Parts & Tech", you'll find an Excel file: Hardware - JH Nuts & Bolts by Jim ...   11-02-2015 01:20 am

Engine & Transmission > Differences between MkII engine and GT engine? (16 replies - 6684 views)

t4brew wrote: If the GT 907 engine you are looking at still has the air rail you may need to find plugs for the air injection ...   09-17-2015 05:45 am

Engine & Transmission > Timing Belt Noise (6 replies - 3018 views)

Are the pulleys worn such that the belt is running against a stepped edge? Worn pulleys should be replaced. Regards, Tim Engel ...   09-02-2015 08:21 pm

Engine & Transmission > Timing Belt Noise (6 replies - 3018 views)

Bogie07 wrote: After sitting for a couple months, I started my car up and drove it for a while. It ran fine, but once it was ...   09-02-2015 08:18 pm

Carburetors > DHLA 45s possibly boiling? (21 replies - 11320 views)

The first step to a good carb tune-up is to give the ignition a good tune-up, so don't give up on that. ...   06-21-2015 05:19 am

Carburetors > DHLA 45s possibly boiling? (21 replies - 11320 views)

These Jenvey twin, long throttle bodies mimic the DHLA / DCOE size and footprint. http://www.jenvey.co.uk/images/stories/virtuemart/product/tb45_d.pdf Quoting: "The TB body is designed with major dimensions identical to twin horizontal ...   06-21-2015 04:59 am

Carburetors > DHLA 45s possibly boiling? (21 replies - 11320 views)

subwoofer wrote: 3. Stale fuel. Fuel is from last year, but it did the same thing last year when the fuel was fresh. Also, expected outcome ...   06-17-2015 08:01 pm

Carburetors > DHLA 45s possibly boiling? (21 replies - 11320 views)

gmgiltd wrote: I understand he is working on a system to go inside DHLA's so it might be worth a call.I've also seen fuel injection systems ...   06-17-2015 07:27 pm

Carburetors > DHLA 45s possibly boiling? (21 replies - 11320 views)

Joachim, Are your Dellortos stock Jensen-Healey spec? And are they emissions or non-emissions? What is the elevation above sea level where you ...   06-17-2015 07:25 pm

Engine & Transmission > renovated engine burning oil (46 replies - 18771 views)

I lied, I do have a liner handy and it's OD at the step/ seat is: 4.294" (109 mm). So a liner shim would need to be ...   04-27-2015 09:33 pm

Engine & Transmission > renovated engine burning oil (46 replies - 18771 views)

I don't recall any liner shims, but then there were a few J-H parts that never made it to the Lotus world. But ...   04-27-2015 08:32 pm

Engine & Transmission > renovated engine burning oil (46 replies - 18771 views)

New liners need to be fitted to the block as required to produce the correct 'nip'... the liner's exposure above the block deck. ...   04-26-2015 05:20 pm

Engine & Transmission > renovated engine burning oil (46 replies - 18771 views)

Barthol, The liner bore is to be measured at 50mm down from top, across the thrust axis Grade A = 3.7510 - 3.7515" (95.275 ...   04-26-2015 04:24 pm

Engine & Transmission > renovated engine burning oil (46 replies - 18771 views)

The rings should not be gapped to a 'minimum', and there's such a thing as too tight. Each type of ring will have ...   04-25-2015 04:12 pm

Engine & Transmission > renovated engine burning oil (46 replies - 18771 views)

Kim, 'What you describe' indicates the rings are the cause of your smoke problem. If you disassemble the engine again, then take advantage of the opportunity to ...   04-25-2015 03:52 pm

Engine & Transmission > renovated engine burning oil (46 replies - 18771 views)

Barthol wrote: (Snip)... I got the below tolerances measured in 1/100 mm and they all looks to be more than double of the max allowed 4,5 ...   04-06-2015 03:02 am

Wheels > Motor oil viscosoity (12 replies - 7850 views)

rday wrote: Thanks All,    Your comment on a lighter viscosity oil affecting engine temperature makes me wonder if this is why the engine runs hot.  Around ...   03-31-2015 01:53 am

Engine & Transmission > Exhaust Header Removal and Cam Covers (15 replies - 6975 views)

Loosening the left engine mount, and jacking up the left side of the engine will both raise the engine, and rotate it to the right ...   03-30-2015 07:07 pm

Engine & Transmission > Exhaust Header Removal and Cam Covers (15 replies - 6975 views)

The original steel-asbestos-steel gasket between the header and the head aren't bad, but they do tend to blow over time. The exhaust manifold ...   03-30-2015 06:54 pm

Wheels > Motor oil viscosoity (12 replies - 7850 views)

Oil viscosities are ranges, not values (SAE 50 = 900-1300 Saybolt Universal Seconds at 100 F). It's possible for one 50wt oil to ...   03-30-2015 06:32 pm


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