solid lifters clearance

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Pitschi
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solid lifters clearance

Post by Pitschi »

Hi there,

running solid lifters (Chevy) and adj. steel rockerarms (Volvo) on the RV8 (not built by myself) and after approx. 3000 miles it sounds a bit noisier now. Can anybody tell me how much clearance for new adjustment? 25 thou? #

Thanks in advance

Cheers
Pitschi



Coops
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Re: solid lifters clearance

Post by Coops »

mines about 24thou i think.
12 cold
all depends on your cam recommendations?
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Pitschi
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Re: solid lifters clearance

Post by Pitschi »

Problem is, that I don't know what cam was used :-(
Just know, and I hope it is true, that a Holbay cam was used.
When I refer what cams where possible, I found:
Holbay 111R 39/73/73/39 292° .429" Hyd. Fast Road The Tornado
Holbay 125LHC 40/84/89/45 304/314° .520"/.541" Hyd. Competition Designed for maximum performance within rpm limits of hyd. lifters.
Holbay K3A 58/88/74/50 326/304° .432" Solid Competition High torque design.
Holbay 751R 63/95/95/63 338° .451 " Solid Competition Maximum bhp at higher rpm.

When the spcification is true, only two are possible.

Coops
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Re: solid lifters clearance

Post by Coops »

solid lifter cams are always a bit noisier than hydraulic ive been told
Regards Tony C (COOPS)
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MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts. :D
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk

Pitschi
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Re: solid lifters clearance

Post by Pitschi »

Just want to check, if everything is okay or need an adjustment, just for sure.

strokerengine
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Re: solid lifters clearance

Post by strokerengine »

Solid lifter clearance various with cam profiles.
Some are as loose as .028" while others tighter at .016.
Living in the US I use the old imperial system, so inches.

An engine grows when it gets hot.
I found iron blocks with aluminum heads grow about .006".
Just today I checked a motor hot that I had set the solid rollers to .010" and it was right around .015 to .017 hot, which is right where I wanted it.
Not so sure how much iron heads grow, do do a lot of them, but I'd guess .003" to .004".

You can cheat a bit and run a cam tighter than specified, it will pick up higher RPM due to increasing the duration, but I'd only recommend do that for racing.

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Re: solid lifters clearance

Post by Darkspeed »

Clearances on the Kent M248 and M253 are 0.55 and 0.66 respectively (mm) so .025" should be a reasonable assumption
4.5L V8 Ginetta G27

Pitschi
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Re: solid lifters clearance

Post by Pitschi »

I was thinking in mm. 0.25 mm aka 10 thou ""

25 thou " is a huge 0.635 mm.

Confused now :(

Pitschi
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Re: solid lifters clearance

Post by Pitschi »

I'll try 25 thou".

stevieturbo
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Re: solid lifters clearance

Post by stevieturbo »

And make sure if it's a hot tolerance....it's checked hot !

It's surprising how much the engine expands from cold and the clearances can increase....on an all alloy engine.

Apparently on those with iron parts, it can go the other way !

On my LS, the cam setup I have, I set tight, no lash when cold...and when it's warmed up it ends up around 10-12 thou.
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