21jigsaw

Hi, I have taken 2 pieces of foam, placed 1 in OAT and 1 ethelyne glycol coolant brought to the boil and simmered for 20 minutes now on the shelf in the garage soaking. 

Roger what coolant were you using?

Hi Stu,

Cut off the vent pipes and welded the holes. If you want the screw specs drop me a PM.

Dave

Quite so extra oil capacity is a great help with aeration and surge.The beauty of the apollo is that it does a good job of purging / bleeding off the aerated oil into the cam cover. The oil feed to the apollo directing the flow around the outer wall hence the aerated less dense oil forced to the centre and bled off the top to the cam cover.The oil pump pressure relief valve opening around the 1500 rev/min consequently has capacity in hand.

Dave

The Caterham sump being shallow and of low volume suffers from oil surge and aeration. The reason for adding the  foam to reduce aeration of the oil hence keep control of the hydraulic tappets. Aeration of the oil feed to the hydraulic tappets acts much the same as a spring resulting in bounce, increased tappet clearance and loss of control of the valves resulting in either bent or the valve head dropping off through a bending fatigue mode of failure. When aerated oil contacts a solid object it  purges the air from the oil (burst the bubbles) ie swirl pots.. The foam / baffles were assessed by circles both left and right hand just under the rev limiter in low gear max cornering G,max braking and acceleration ,  oil as hot as possible noting oil pressure then returning to idle and listen for noisy tappets.

The apollo  cures the aeration and surge issues,  cheaper than dry sump

Dave

Wanted trailer tyre rack.

Thermostat wrong way round?

Brocol, Coventry.

Wanted - Tyre rack for a Brian James Race Shuttle 

Thanks for the thought but it will be to short for a 21.

Dave

Shuttle 2 purchased.

Thanks

SV Hood new still in wrapping - no history came in a batch of other parts I bought for Jigsaw. £100 SOLD

Dry sump scavenge pipe £50 ( what i paid for it)SOLD

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K bell housing wet sump never fitted £130

Gold oil scavenge pump £400 SOLD

I have a couple of Longacre mirror Brkts short ones 38mm dia if thats any help.

Dave

I just require a clutch release arm, anything considered  broken, bent, worn to use for a pattern / rework.

Regards

Dave

Just got the two pipe assembleys so if any one needs one mail me,  cant seem to find  stock of the clutch release arm, any broken damaged worn ones around? anything will do.

Dave

Rover dry sump clutch release arm

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Hi line dry sump scavenge pipe assy.

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Bell housing bottom plate

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Wanted - 3.38 diff any condition spec considered.- resolved.

SV rear anti roll bar 1/2" dia new £20

SV hood zipped rear window new £120

Steering wheel boss slight mark never fitted £15

K Series bellhousing £140

Collection from CV32 or add P&P

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Has anyone had experience of the wide-band AFR meters if so any tips or recommendations?

http://www.lotus7.club/comment/2099472#comment-2099472

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Does anyone have Willwood or Hi Spec mechanical hand brake calipers they no longer require.

The pistons fitted in the MGF Trophy 160  were the 145 bhp VVC pistons. After completion of  high speed test  ( 200 hours at 6500 rev/min full throttle) post test inspection found cracks between the crown and top ring groove,  the  piston redesigned  for the VVC 160  in the TF and ZR (ECD3).identified by 160 on the piston crown.

VVCR is based on the 160VVC ecd3 engine running mems engine management 7300 max revs. 

The initial development of the k series into Caterham required a north / south installation as opposed  to the east west. The other major issue was the height of the engine the bonnet line had to remain undisturbed . The installation was  12deg as per Rover installation. This in turn effected the design of the sump. The standard sump not being an option.

During the development phase engine failures occurred, examination revealed valve failure due to  oil airation. The baffle was modified and foam added to reduce the suspension of air in the oil. ( the air  is purged from the oil when the airated oil contacts an object). This resolved the issue.

It appears the cause of failure of the foam can be down to :-

 A) Foam  - original quality , specification, age, contamination, batches, shelf life, stock rotation, supplier.

B) Degradation due to oil, coolant, fuel.

C) Working inviroment.

My moneys on A.

The foam fitted to my car was from 1996 .

C21 supersport, 14yrs and 20k miles. Oil changed every 5k. The foam was a bit crispy / age hardened but still fully functional when changed. Seems like there is another factor in all of this.