free hit
counters
Esprit Turbo project car - part3 - the further continuation - Page 151 - Esprit 'Project & Restoration' Room - The Lotus Forums Jump to content
Lotusfab

Esprit Turbo project car - part3 - the further continuation

Recommended Posts

2 hours ago, CHANGES said:

 

Try looking on the other half of the crank housing..  The mod is usually done on there not the block half.. !!!!

Thanks!  Good job I havn't adjusted it! Hopefully I would have checked the manual again before doing anything! IMG_6029.thumb.PNG.e9af13428c05b86e6d2b78cab3b483e1.PNGDave, do you notice anything usual about the second compression ring in this picture? I.e. Is it up the correct way? There are no markings  any of the rings and they have all been installed lip to top??.

have measured the end float on the camshafts inlet 10 thou, outlet 8 thou.

main crank 12 thou.

crankshaft journals all inspec.

Pison/liner measurents

liner 1 95.30mm

liner 2 95.28mm

liner 3 95.28mm

liner 4 95.29mm

piston diameters

piston 1      95.17mm

piston 2      95.17 mm

piston 3       95.16 mm

piston  4       95.16 mm

of course there is an error margin on the measurements which I have repeated several times.hIMG_6028.thumb.PNG.40c9ab314b42e184e35bf2a555c73a53.PNG

I have grade B liners and pistons.

Dave is the second ring on correctly? Groove at the top????aIMG_5991.thumb.JPG.b80927c74e2edac8c37388e663d04b6a.JPG

There are no markings on any of the rings. The upper ring is rectangular so appears it can be fitted either way. The second to me appears as though it should be the other way and the rails and scraper look ok.

If you expand the pic you can see the groovevin the second ring faces upwards.

Share this post


Link to post
Share on other sites

Upgrade today to remove Google ads and support TLF.

IMG_6030.thumb.PNG.d5e259304a07168636fbb04ac4cfe4cf.PNG

Note some of the measurements are close to the edge of spec. Because of the reading error I'm inclined to refit the pistons and use the existing liners. I think though because of the importance of getting this correct I'm going to have it all checked by an expert before reassembly. Nows the  time to replace parts if necessary. Was quite surprised by the mount of end float on the camshafts. One is out of spec. Once again very please I took this apart! Right off to check the other bearing housing for the mod! 😀😀😀😀Glad I hadn't done it or it might not be so Funny! Thanks, Dave! 👍🏻

Share this post


Link to post
Share on other sites

No bearing mod. No groove in the No 5 bearing shell.IMG_6033.thumb.JPG.f4c8184f50febc8cc6c313ffcb27929d.JPG

Share this post


Link to post
Share on other sites

IMG_6037.thumb.JPG.5d09035f50e6418d42836a5e48660888.JPGIMG_6038.thumb.JPG.fe86dd35dc0816816e991b9b77e91a95.JPGIMG_6039.thumb.JPG.8ed6b867d2c1ab169686fe86bcfb800d.JPGWell have stripped the cam shafts and head. stranegly the inlet valves all seem very clean and perfect in their seats. The exhaust valves have too much play. At least a couple need replacing and possible guide work. Looks like someone has done the head, but not a very comprehensive job, in fact only the inlet side! 

I have also decided because of my unfamiliarity with the engine I will take all of it up to PNM for an expert opinion and detailed examination. I think they will have to hold onto the head for a recon. We will see. 

Share this post


Link to post
Share on other sites

Well think Inwas wrong. I have measured the exhaust guides and valves. After cleaning them up and measuring they all have hardly any wear. They all have the correct clearance. It appears the play at Cold is correct!IMG_6048.thumb.JPG.e516eeee2eb7a9bbc9b681eabf36c918.JPGIMG_6049.thumb.JPG.0f6852504043a0459604ab30f713c3ec.JPGIMG_6050.thumb.JPG.3e1f345b69439cf5308269fe76b6fcd7.JPGthe whole top end of the engine is now with the aqua blasters! I think I'm still going to paint it when it returns. Any other thoughts?

It's all still going up to see Pete at PNM! 

  • Like 1

Share this post


Link to post
Share on other sites

Engine Experts

Is that second compression ring the wrong way round? There are no markings on any of them. The groove is a the top. My cards on the table I think it should be groove at the bottom? It would really help if some has a definitive answer?IMG_5991.thumb.JPG.f79ead61a96158cff50506ae4c6c8ef8.JPG

I have measured most of engine. Within the error margin of the readings it all appears in good shape. Despite this I believe it's worth getting someone with forty years experience having a look. 

If the second ring is inverted surely the oil will scrape to the top when it should be scrapping it to the bottom?.

Share this post


Link to post
Share on other sites

Fabian, I'm no engine builder though I have successful experience in Lotus Twincam cylinder head work, specifically guide clearance and port/seat work. It's correct to mike the stem diameters for wear but have you tested the guides' ID's for wear with plug gauges? That would be a finely graded set of rods, fractionally larger and smaller than valve stem diameters to be used as " go, no-go " checks. The intakes will tolerate very tight clearances indeed, and exhausts are not a great deal further out when optimal for road use.

As to the 2nd rings, they look to be of the Napier scraper type and, if so, are to be run the other way around as you suspect. The ridge/edge functions to complete oil control beyond what the main oil ring assembly will do.

  • Like 1

Share this post


Link to post
Share on other sites

Thanks Steve, very useful info. I measured the internal diameter of the guides using the micrometer and expanding guage. I got the same readings for all the guides. They all measured the lowest internal diameter in the range. The valves were at the thickest diameter of the range. There's little play on the inlet valves by feel. The exhaust there is more play but theyvall feel the same. I conclude this is normal, butbitbwill be getting checked by PMN. 

Thanks for the ring info I will look up the ring type. 

Share this post


Link to post
Share on other sites

Thanks Steve just found this, seems to confirm the middle ring is on upside down as I suspected?IMG_6062.thumb.PNG.de56bc8bdc304c545feda779cfbab7de.PNG

Share this post


Link to post
Share on other sites

There's only two things I can criticise on this car build. The fuel tanks and the radiator. I'm thinking if taking it  apart again  and replacing them. Has anyone used the aluminium S and J fuel tanks? Axminster are perfect but pricey. S and J are £260 plus vat. But I don't wish to use them if the quality is not spot on. Thanks.

It's a lot of money but this is way beyond what I thought anyway. If I were to sell it would only ever be at perfect prices, so I guess that means aluminium.

Share this post


Link to post
Share on other sites

Been thinking about it. I'm probably going to replace the middle rings, even though they are new. The reason being the modern design is better so it seems foolish not to out them now.

The cylinder head etc will be stunning after the aqua blast the trouble is the finish will not endure. I think I'm leaning towards painting the aqua blasted bits. Still it will have saved a lot of work on the head and be totally carbon free! Those core plugs are a bugger. I removed all of them. Try not to knock the top ones into the head. If you do you will have great fun trying to remove them. At first I spent ages, but then I got a technique and can now remove them very quickly. In essence you need to get the plug up against a straight edge placed into the hole and then lever them out. Best not to whack them through in the first place! 

Share this post


Link to post
Share on other sites

Still undecided on painting the metal bits.

Getting into the Doldrums a bit with this now after 2.75 years! But there it sits with no engine😫😫😫😫IMG_6083.thumb.JPG.d6e18f340862e9164fdef726b4dcd014.JPG

Latest problem that's tipped me over the edge the gearvlever is 7 mm and the knob 8 mm, only a Lotus can do this stuff!

Share this post


Link to post
Share on other sites
On 20/01/2019 at 15:29, Lotusfab said:

How to

I d say thats way too much sealant.

If its assembled and any is squeezed out of the joint thats exactly what has happened inside.

Which will get into water ways or oil ways. Multiple times on this forum people have had seize engines caused by hylomar or silicone blocking the oil ways.

 

just a heads up. 

 

buddsy

  • Like 2

 

"Belief is the enemy of knowing" - Crrow777

Share this post


Link to post
Share on other sites

Must be a manager putting it on! 

1 hour ago, Buddsy said:

I d say thats way too much sealant.

If its assembled and any is squeezed out of the joint thats exactly what has happened inside.

Which will get into water ways or oil ways. Multiple times on this forum people have had seize engines caused by hylomar or silicone blocking the oil ways.

 

just a heads up. 

 

buddsy

What's your view on painting get aquablasted engines?

Share this post


Link to post
Share on other sites

 

 

This ain't me! But it's a good vid.

Share this post


Link to post
Share on other sites
58 minutes ago, Lotusfab said:

Must be a manager putting it on! 

What's your view on painting get aquablasted engines?

I used McGuire alloy wheel cleaner with a wire brush then used Por15 Engine eneamel.

Copy (1) of IMG_0066.JPG

buddsy

  • Like 2

 

"Belief is the enemy of knowing" - Crrow777

Share this post


Link to post
Share on other sites

Nice!

14 minutes ago, Buddsy said:

I used McGuire alloy wheel cleaner with a wire brush then used Por15 Engine eneamel.

Copy (1) of IMG_0066.JPG

buddsy

What's the manifold done in?

Share this post


Link to post
Share on other sites

Could this be the way to protect Aqua blasted Ali? 

 

Share this post


Link to post
Share on other sites
7 hours ago, Lotusfab said:

Nice!

What's the manifold done in?

I had the turbo and manifold done in the zircotec

 

buddsy

  • Like 1

 

"Belief is the enemy of knowing" - Crrow777

Share this post


Link to post
Share on other sites

I was looking at that it looks great and much better heat dispertion. My manifold has been welded though. I may have found another manifold to use which is perfect.

Share this post


Link to post
Share on other sites
8 hours ago, Buddsy said:

I had the turbo and manifold done in the zircotec

 

buddsy

How does your wastegate not look like something salvaged from the Titanic which they usually do ? It looks new but the same model as the original one?

Share this post


Link to post
Share on other sites
25 minutes ago, Andyww said:

How does your wastegate not look like something salvaged from the Titanic which they usually do ? It looks new but the same model as the original one?

I guess thats the zircotec coating. Still looks pretty good after 5/6 years.

 

buddsy

  • Like 1

 

"Belief is the enemy of knowing" - Crrow777

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...