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 Posted: Sep 30, 2015 05:06PM
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US

Thanks for the clarification Jemal.

 Posted: Sep 30, 2015 12:22PM
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US


This is one of those areas where there is flexibility... There generally is no "danger"!  Stock engines with standard ratio arms can safely use .012 for both intake and exhaust. You get a quieter engine, and possibly incrementally more 'performance'.  Depending on the cam and the intended use. you can vary a little with no harm.... Most "stock" clearances are in the .012-.016 (thou) range, and most 1.5 arms say to "add a couple".  I just set an Elgin race cam with about 1/2 inch valve lift at .015 intake and .018 exhaust.  Real "big" race cams give numbers of .018-.020.

I say use your discretion.... If you think you'll see extended RPMs above 6000, add a couple thou of clearance!  And careful with the chart that jeg put up... it is riddled with errors (NOT jeg's fault obviously!... just be careful!  If an 002 is "one up from a Cooper S" does that mean a Cooper S had an 001??  I think not!)

 Posted: Sep 30, 2015 11:01AM
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US

Dennis is this measurement for both 1.3 and 1.5 inch lift rockers? 

 Posted: Sep 30, 2015 07:39AM
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US
Quote:
Originally Posted by Spank

Anyone know the valve lash settings for the CAM003 Minimania sells? On stock rockers, do they do stock .012" or are they more like Kent who specify .015"

 

Spec is .014 on the CAM003

 

  
Racine-web DesignDennis Racine
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 Posted: Sep 29, 2015 01:20PM
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US

Spank, sorry I couldn't get you the valve lash specs for the cam but I am glad the engine worked out for you.  when I was running it I set it around .015 for both exhaust/intake.

 Posted: Sep 27, 2015 06:34PM
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The valve lash depends on the lift NOT the duration of the cam. If you don't know the lift then I would increase the the valve lash just in case. 

The power of accurate observation is commonly called cynicism by those who have not got it. G.B.S. Sarcasm is the lowest form of wit. Oscar Wilde

//www.cupcakecooper.ca/

 Posted: Sep 27, 2015 06:06PM
 Edited:  Sep 27, 2015 06:15PM
jeg
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almost -

MiniMania's CAM003 appears to be close to Elgin's 66-15 and 67-18 which I've highlighted for you.  Because of the variance on the exhaust valve, I'd be tempted to call MiniMania and ask.

Camshaft No.

Seat to Seat Duration In/Ex

Duration @ .50 Cam Lift

Cam Lift In/Ex

Valve Lift In/Ex 1.25 Rockers

Valve Lift In/Ex 1.5 Rockers

Application

CAM001

244/264

198/215

.264/.264

327/327

393/393

Mild road, smooth idle.

CAM002

250/264

208/215

.250/.264

312/327

375/393

One up from Cooper 'S' spec.

CAM6608

264/264

217/217

.262/.262

327/327

393/393

Max. for smog emmissions.

CAM003

264/268

215/222

.264/.289

327/358

393/430

Fast road cam.

CAM004

262/268

225/230

.293/.318

366/397

439/477

Fast road cam. 9.1:1 compression recommended.

CAM6708

268/268

222/222

.289/.289

361/361

433/433

Mini & 1275. Will work with stock engine.

CAM6707

268/268

230/230

.318/.318

397/397

477/477

Heavy duty springs reqd. Cylinder head porting recommended

CAM005

268/278

230/240

.318/.321

397/401

477/401

Hot street. Header recommended. 9.5:1 compression.

CAM7008

280/280

228/228

.263/.263

329/329

395/395

Hot street. Must have header to idle. 9.5:1 compression, heavy duty valve springs & good cyl. head are req. Adv. cam +2 deg.

CAM7007

280/280

228/228

.278/.278

348/348

417/417

Hot street grind. Same reqs as above.

CAM7107

284/284

235/235

.290/.290

363/393

435/435

Autocross. 9.5:1 compression required.

CAM71506

286/286

242/242

.302/.302

378/378

453/453

Autocross. 10:1 compression required.

CAM7207

288/288

235/235

.290/.290

363/363

435/435

Autocross. 10:1 compression required.

CAM006

288/292

235/254

.293/.321

366/401

439/481

Autocross. 11:1 compression required.Pump gas okay.

CAM7505

300/300

250/250

.297/.297

371/371

446/446

Race grind. 11:1 compression reqd.

CAM007

300/300

250/250

.323/.323

404/404

485/485

Race grind. 11:1 compression reqd.

CAM76506

306/306

261/261

.341/.341

426/426

512/512

Full race. 13:1 compression reqd.

CAM7706-32

308/308

255/255

.322/.322

403/403

483/483

Full race. 13:1 compression reqd. Power range from 4500-7500

CAM7706-34

308/308

263/263

.348/.348

435/435

522/522

Full race. 13:1 compression reqd.

CAM3503

310/310

268/268

.380/.380

475/457

570/570

Race. Works best for 1275-1380cc engines.

Elgin's catalogue:  //www.elgincams.com/c-aus2.html

AUSTIN HEALY SPRITE, MG MIDGET, AND MINI PROFILES

“A” SERIES 848-1275cc ENGINES.   TAPPET DIAM.  = .812   STD ROCKER RATIO = 1.25:1   BMC A SERIES CAMS ARE 5 DEGREES RETARDED FROM THE FACTORY.  OFFSET KEYS REQUIRED TO CHANGE CAM TIMING.  NITRIDING STRONGLY RECOMMENDED FOR ALL BMC RACING CAMS.

 

  GRIND NO.

SEAT DURATION

.050” DURATION

CAM LIFT

LASH

APPLICATION

66-15

264

217

.262

I .015

E .017

ONE STEP UP FROM STOCK.

67-18

268

222

.289

I .018

E .020

1275-NEEDS PERFORMANCE SPRINGS

685-16

274

230

.295

I .016

E .018

SPRINGS & PORTED HEAD RECOMMENDED.

70-9

280

228

.263

I .009

E .011

HOT STREET 9:1, SPRINGS & HEADER.

70-10

280

228

.278

I .010

E .012

HOT STREET 9:1. SPRINGS, HEADER, REWORKED HEAD.

71-15

284

235

.290

I .015

E .017

AUTOCROSS 9.5:1 SPRINGS, GOOD HEAD, & WEBER.

715-18

286

242

.302

I .017

E .019

AUTOCROSS 10:1

SAME AS ABOVE.

72-10

288

235

.290

I .011

E .013

AUTOCROSS 10.5:1

SAME AS ABOVE.

75-15

300

250

.297

I .014

E .016

RACE GRIND. 11+:1

SAME AS ABOVE.

75-12

300

250

.323

I .013

E .015

RACE GRIND. REQUIRES BETTER HEAD THAN ABOVE.

M77-13

308

255

.321

I .014

E .016

FULL RACE APPLICATION 45-7500 RPM. 12+:1

765-14

306

261

.341

I .014

E .016

RACE. 12.5:1 REQUIRED

77-12

 

308

263

.348

I .014

E .016

RACE 13:1 MAX FOR PREPARED 948cc, MUST DYNO TUNE.

775-18

 

310

268

.380

I .022

E .024

RACE. WORKS BEST FOR 1275-1440cc ENGINES.

 

The peasants are revolting...          

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 Posted: Sep 27, 2015 03:05PM
 Edited:  Sep 28, 2015 02:49AM
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Somebody out there should have Elgin numbers.  If no real data arrives, with stock rockers you should be safe with stock clearance on intake and +.002 on exhaust.  If you can't have the cam itself Camdoctored, degree check it in the block with checker springs to see if the lobes are symmetric around center, if so (most likely) then you can make an informed choice for split overlap, rocker ratio, and rocker setting.

 Posted: Sep 27, 2015 08:04AM
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 Posted: Sep 27, 2015 07:07AM
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Anyone know the valve lash settings for the CAM003 Minimania sells? On stock rockers, do they do stock .012" or are they more like Kent who specify .015"