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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Barthol wrote: (Snip)... Using a dealer gauge shows me a clearance of 0,75 mm between the liner and the piston again with the piston in the ...   03-29-2015 10:11 pm

Illustrations end up pretty lo-res by the time they're uploaded to JHPS. You can download clearer versions from my Dropbox account, here: https://www.dropbox.com/sh/kwl3ckub3in3wrm/AAA3CRJImDKvpslh-ySyQ_sza?dl=0 They're not ...   03-23-2015 09:49 pm

Review message #21. I've substituted a different JPEG attachment which illustrates a typical T-belt snubber (Aux Pulley location), the short spacers used with ...   03-23-2015 09:27 pm

Notice the front main seal housing on the left is for use with the early eccentric tensioner, and is similar to the J-H unit. The later ...   03-23-2015 07:21 pm

Here's an illustration showing the A/C compressor mounting brackets. Note the two welded-in bosses surrounding the bolt holes in the upper right of ...   03-23-2015 05:21 pm

Barthol wrote: (Snip)... I have a semi automatic tightener but I cannot find out how to mount it. It looks like I am missing threaded ...   03-22-2015 10:15 pm

Barthol wrote: (Snip)... I need to sort an issue with the belt tightening wheel . The bolt is pulling a little to the left when I ...   03-22-2015 09:48 pm

Barthol wrote: If I pull the engine out again and need to install my old engine I need to sort an issue with the belt tightening ...   03-22-2015 08:48 pm

Barthol wrote: I have no idea on how the bottom end is built. It was done from the Guy in Uk from who I bought ...   03-22-2015 08:40 pm

Good, they're more fun above 4500 rpm anyway. The 104/107 cam combination is the same as was used in the 912 HC. I've not ...   03-22-2015 06:01 am

The 907 is not supposed to have valve guide seals. The engine is designed for high rpm operation, and that requires adequate lubrication ...   03-22-2015 05:43 am

user=1922]mcguan.2 wrote:I do not know if I have the petronix ignition. How can I tell?.Remove the distributor cap and look inside. If ...   01-26-2015 03:29 am

Barthol wrote:To match the single carb barrels i have to open the air correction screw on the stronger barrel 5-6 turns , and this ...   01-26-2015 02:48 am

Mark Rosenbaum wrote about using a multi-meter. That will work, but I prefer to use a continuity light. The light only ...   01-21-2015 05:28 pm

Does the distributor still have the original breaker points, or has an electronic ignition system (like Pertronix) been installed? Just considering other things ...   01-21-2015 05:19 pm

I wanted to ask you first so I didn't step on any toes if the JHPS club store carried them. The Lotus OEM front seal tool ...   11-07-2014 06:53 pm

Greg, Does the JHPS store carry the 907 seal centering tools? Tim ...   11-06-2014 07:00 pm

The Elite-Eclat airbox used to be available through Lotusbits in the UK. However, I talked with Mike Taylor a while ago, and he ...   10-06-2014 12:18 am