LT-5 prototype engine - ZR-1 Net Registry Forums

LGAFF · 02-02-2009

Anyone got one of these:

tccrab · 02-02-2009

Hmmm....
All these Lotus engines look vaguely familiar.
What's up with that?

TomC
"Crabs"

jonszr1 · 02-02-2009

wow wouldnt that have been nice to have a timming belt instead of chains

flyin ryan · 02-03-2009

Quote:

Originally Posted by jonszr1

wow wouldnt that have been nice to have a timming belt instead of chains

Yup...

tomtom72 · 02-03-2009

Forgive my dumbness.....but why a belt/ or belts(?) instead of chains?

Polo-1 · 02-03-2009

rubber bands will go on passed the 8,000 rpm. Are chains will not. Weight of the metal chains not so good.

limey · 02-04-2009

I for one am glad they built the motor with chains, if it was with belts, guys would be bending valves left and right by not sticking to service intervals.

Belts are good for 30-50k miles and then have to be changed, at least 20 years they did, i've never heard of anyone replacing chains at those mileage intervals due to wear & when did you ever hear an LT5 jump a tooth on the timing, never, but with belts, guaranteed there would be incidents.

flyin ryan · 02-04-2009

Belt's help absorb harmonics, usually take a tiny amount less power to run but most importantly they won't go into 'Cordual action' like a chain. basically a chain will want to start whipping around in an 'S' shape to a certain degree, that of coarse throws the timing/valve events off, in relation to the crank at higher RPM. don't have time to get into it any more than that right now, felt it at least deserved a quick reply for now.

Paul Workman · 02-04-2009

Setting cam timing on that engine might be a "tad" easier too!

P.

tomtom72 · 02-04-2009

Thank you guys for explaining it to me.

Ideally, instead of our three chains, we would only have one belt & an idler pulley(s) if the development went in that direction. I guess from looking at the pictures. We have chain tensioners and a belt system would use the idler pulley(s) for that function. Do I get that part?

Therefore when timming the cams if it was one belt you would set all the alignment marks up and release the idler(s) and wait to see how much movement you got so you would know how many teeth to add or subtract to actually get the marks aligned in the tension mode?

Thanks for indulging my Q's.

Tom

02-02-2009	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	LT-5 prototype engine Anyone got one of these: __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

02-02-2009	#2
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,657	Re: LT-5 prototype engine Hmmm.... All these Lotus engines look vaguely familiar. What's up with that? TomC "Crabs"

02-02-2009	#3
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,406	Re: LT-5 prototype engine wow wouldnt that have been nice to have a timming belt instead of chains

02-03-2009	#5
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: LT-5 prototype engine Forgive my dumbness.....but why a belt/ or belts(?) instead of chains? __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

02-03-2009	#6
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 956	Re: LT-5 prototype engine rubber bands will go on passed the 8,000 rpm. Are chains will not. Weight of the metal chains not so good.

02-04-2009	#7
limey Join Date: Oct 2008 Location: tampa Posts: 537	Re: LT-5 prototype engine I for one am glad they built the motor with chains, if it was with belts, guys would be bending valves left and right by not sticking to service intervals. Belts are good for 30-50k miles and then have to be changed, at least 20 years they did, i've never heard of anyone replacing chains at those mileage intervals due to wear & when did you ever hear an LT5 jump a tooth on the timing, never, but with belts, guaranteed there would be incidents.

02-04-2009	#8
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,736	Re: LT-5 prototype engine Belt's help absorb harmonics, usually take a tiny amount less power to run but most importantly they won't go into 'Cordual action' like a chain. basically a chain will want to start whipping around in an 'S' shape to a certain degree, that of coarse throws the timing/valve events off, in relation to the crank at higher RPM. don't have time to get into it any more than that right now, felt it at least deserved a quick reply for now.

02-04-2009	#9
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: LT-5 prototype engine Setting cam timing on that engine might be a "tad" easier too! P.

02-04-2009	#10
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: LT-5 prototype engine Thank you guys for explaining it to me. Ideally, instead of our three chains, we would only have one belt & an idler pulley(s) if the development went in that direction. I guess from looking at the pictures. We have chain tensioners and a belt system would use the idler pulley(s) for that function. Do I get that part? Therefore when timming the cams if it was one belt you would set all the alignment marks up and release the idler(s) and wait to see how much movement you got so you would know how many teeth to add or subtract to actually get the marks aligned in the tension mode? Thanks for indulging my Q's. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member Last edited by tomtom72; 02-04-2009 at 07:03 AM.