Search found 227 matches

by Esprit2
Sun Nov 06, 2022 02:19
Forum: Engine and Gearbox
Topic: Valve Shims
Replies: 14
Views: 439

Re: Valve Shims

Lotus valve shims for Twin Cam and 9XX engines are the same. And both are interchangeable with shims for the Triumph TR7 and older Jaguar XK 6-cylinder engines (Moss Motors, Victoria British, The Roadster Factory... etc), Saab 99 2-valve, Cosworth, Coventry-Climax (vintage racing suppliers) and the ...
by Esprit2
Mon Sep 05, 2022 06:59
Forum: Wheels and Tyres
Topic: Standard wheel offset
Replies: 7
Views: 1339

Re: Standard wheel offset

15" x 7" . . . . Rim Size, Inch +23.3. . . . . . Offset 60mm. . . . . . Center Bore 5 x 4 1/4" . . . Bolt Circle, Inch 5 x 108mm . . Bolt Circle, Metric When you ask about Offset, be aware that some websites or retailers will reply with ET. Offset and ET are NOT the same thing. Measured on the same ...
by Esprit2
Mon Aug 01, 2022 18:45
Forum: Engine and Gearbox
Topic: Waterpump dismantle tips?
Replies: 8
Views: 2689

Re: Waterpump dismantle tips?

The impeller used in the 907 pumps had very few, short vanes. That may (??) also apply to the 912LC. The 910 Turbo and 912HC pumps use an impeller that has more, much longer vanes. That, plus a deeper scroll housing portion of the pump housing means the later pumps can move a lot more coolant for be...
by Esprit2
Mon Aug 01, 2022 18:24
Forum: Engine and Gearbox
Topic: Waterpump dismantle tips?
Replies: 8
Views: 2689

Re: Waterpump dismantle tips?

Follow this link to a PDF file on how to rebuild the water pump: https://tinyurl.com/565eaeay Early seals were over-molded with black rubber, while modern seals are stainless steel. They're easy to tell apart at a glance. Presuming any modern rebuild kit will include the stainless steel seal, you wi...
by Esprit2
Sat Jun 04, 2022 03:03
Forum: Engine and Gearbox
Topic: Does anyone have a copy - Dellorto tuning guide Tim Engel
Replies: 5
Views: 4440

Re: Does anyone have a copy - Dellorto tuning guide Tim Engel

Here are a couple of updates on that same theme:

Balancing Dellorto - 'The Lotus Grand Tourers' - by Tim Engel.pdf
https://tinyurl.com/bdhmukjy

Balancing Dellorto & Weber Carbs - Procedure - Tim Engel.pdf
https://tinyurl.com/5cm35fdx

Regards,
Tim
by Esprit2
Sun May 22, 2022 16:59
Forum: Engine and Gearbox
Topic: Water pump - to gasket or not?
Replies: 6
Views: 464

Re: Water pump - to gasket or not?

Just my opinion, but I avoid using silicone sealants on engines, When you tighten the joint, and a little silicone oozes out, you can easily wipe off the excess. No big deal. But whatever you see oozing out on the outside of the joint, you can bet there's a similar amount on the inside. And while th...
by Esprit2
Sun May 22, 2022 06:15
Forum: Engine and Gearbox
Topic: Comprehensive engine data
Replies: 13
Views: 2049

Re: Comprehensive engine data

Go Here: https://tinyurl.com/mryxsnhk to download a copy of '9XX Engine Rebuild Data, 4-Cyl - Master.xlsx' Note that it's an Microsoft Excel.xlsx 'Workbook' containing multiple 'Worksheets'. Click on the tabs across the bottom of the Workbook to open any Worksheet. "Engine Rebuild Data" is my notebo...
by Esprit2
Sun May 22, 2022 05:35
Forum: Engine and Gearbox
Topic: Cylinder Head flatness and roughness
Replies: 6
Views: 558

Re: Cylinder Head flatness and roughness

Go here: https://tinyurl.com/45kwkm4y This page is from the 93-97 Service Notes simply because I had it handy. The flatness info applies to all 9XX 4-Cylinder heads. "IF" you have the head milled to flatten it, make sure the machinist knows the bottom & top of the head must be parallel. The cranksha...
by Esprit2
Sun May 22, 2022 04:57
Forum: Engine and Gearbox
Topic: Water pump - to gasket or not?
Replies: 6
Views: 464

Re: Water pump - to gasket or not?

I use gaskets for all 9XX 4-cyl applications, regardless of what the Lotus manual says. I've experienced leaks with pumps that are sealed with an anaerobic sealant only, so rather than mess with it anymore, I just put a standard gasket in the joint and seal it with Hylomar AV. It seals well. I'm an ...
by Esprit2
Sun Apr 03, 2022 23:43
Forum: History & Memorabilia
Topic: A nice little write up about the Excel in Car
Replies: 5
Views: 672

Re: A nice little write up about the Excel in Car

Nice article overall, but the author clearly wasn't an expert on the Excel. For instance, he wrote, "At the same time, the rear suspension was modified to incorporate the Esprit’s top link and lower wishbone layout in place of the Elite’s Chapman strut." Wrong Elite. The Type 14 2-seater had Chapman...
by Esprit2
Fri Feb 04, 2022 19:51
Forum: Servicing, Belts, Fuels and Oils
Topic: master cylinder
Replies: 9
Views: 1342

Re: master cylinder

The 'pin' does have to be removed before the piston can be withdrawn. However, it's more than just a pin you can abuse, it's actually a small valve that should be treated well. The piston hits it and tips it, causing it to vent... the 'Tip-it' valve.

Regards,
Tim Engel
by Esprit2
Tue Jan 11, 2022 20:55
Forum: History & Memorabilia
Topic: Buyers Guide for The Wedges - Practical Classics 2002
Replies: 8
Views: 3509

Re: Buyers Guide for The Wedges - Practical Classics 2002

I've cleaned-up those six JPEGs and combined them into one 1.04 meg 6-page PDF. Unfortunately, the original text resolution was a little fuzzy, and it's no better in the PDF. If you want a copy, you can download one here: https://tinyurl.com/4enks6b7 That's my GoogleDrive accounnt, and I have limite...
by Esprit2
Wed Jul 28, 2021 22:28
Forum: Servicing, Belts, Fuels and Oils
Topic: oil (again).
Replies: 6
Views: 1606

Re: oil (again).

Back in the day, Lotus recommended 20W-50 viscosity oil for the 900-Series engines. You can play with the 20W part (cold viscosity), but keep the '50' part (hot viscosity) at 50 or higher... a 10W-60 would be great. And select an oil with a high ZDDP content. Or, more to the point... The P in ZDDP i...
by Esprit2
Thu Jul 08, 2021 18:08
Forum: Engine and Gearbox
Topic: Can the cylinder head be removed while the engine is in the car?
Replies: 13
Views: 2315

Re: Can the cylinder head be removed while the engine is in the car?

It's important to know the final film thickness of the sealant you use. For Loctite 515 & 518, it's 0.0005" / 0.0127mm. What is the film thickness for the "high temperature sealant that you can get from Halfords"? If you don't know, I'd advise against using it. For the optimum service life, shim to ...
by Esprit2
Fri Jun 18, 2021 22:40
Forum: General
Topic: Technical Writeups Lotus Esprit World
Replies: 9
Views: 1613

Re: Technical Writeups Lotus Esprit World

Andy, How about posting a photo... or a link to a photo of the manifold. Is it anything like the manifold used on the Brazilian Emme 422T ? It was a front engine, rear drive, 4-seat sedan that used the Lotus 910S engine. The special manifold placed the turbo down low, toward the front of the engine....