What is the largest CI that LT5 can be built to with stock crank?

[HAWAIIZR-1]

This question is not for me, but one of the ZR-1 guys in Japan. He needs to rebuild his motor and want to build the biggest LT5 possible, but purchasing a new crank is not feasible with cost and shipping. Does anyone know what combination of liners/pistons/rods can be used and what size it will end up?

Sorry if this information is already available and posted. I could not find it if so.

Thanks!!

[1990 415]

Is he willing to do an offset grind on the crank or keep it totally stock? I believe Pete is the person to answer this question.

[jonszr1]

yeah pete can give you all the info ,but i believe its 401ci, offset grinding the crank and using 4.125 piston and liners

[Pete]

Guys i'm no engine builder/expert.

I would say stock crank offset to 3.75 with 4.125 bore makes 401.
i know this will work very well.

I also know stock crank can be offset to 3.85 but i don't know much about 1.900 rods,this will make a 411ci.

I hear different stories on the 1.900 rods they work fine in a 9k RPM Honda some say LT5 parts are heavier so it won't work.:dontknow:
Flyan Ryan might have more input on the 1.900 rods durability.

Pete

P.S.
My choice is 401 should get around 500rwhp w/stock cams cost is about a 1/3 of a 415ci. for the do it yourselfer.

[HAWAIIZR-1]

Thanks guys!!!

I found this on EES: Using your stock crankshaft:
4.100 bore, 3.75 stroke = 396cid
4.125 bore, 3.75 stroke = 401cid

So if this is it I'll pass on to the guy.

Thanks again!!

[HAWAIIZR-1]

Is he willing to do an offset grind on the crank or keep it totally stock? I believe Pete is the person to answer this question.

I'll ask him. I imagine he will want keep it stock. Thanks!

[Polo-1]

The max I would take off the crank is .100 this gives you 2.00 rod journal and stroke of 3.75 I know some people have cut other stock cranks farther, but a LT-5 hollow crank??? I would not like to find out the hard way.
If shipping is a problem, getting the block here and back wont work for the 4.100/125. Unless AES or EES is selling the liners now? Last I heard they only do short block assembled. So your looking at sending 4" liners over sea's.

3.75x4.00 = 377ci

Go with Ron Woods HD liners punch it .060 over = 388ci.

[HAWAIIZR-1]

The max I would take off the crank is .100 this gives you 2.00 rod journal and stroke of 3.75 I know some people have cut other stock cranks farther, but a LT-5 hollow crank??? I would not like to find out the hard way.
If shipping is a problem, getting the block here and back wont work for the 4.100/125. Unless AES or EES is selling the liners now? Last I heard they only do short block assembled. So your looking at sending 4" liners over sea's.

3.75x4.00 = 377ci

Go with Ron Woods HD liners punch it .060 over = 388ci.

Okay, thanks for the info and I'll pass it on. He has been in communication with one of the builders already and they were going to send him a package for $15K to build in Japan. Sounds a little risky but I'm not sure what kind of shops he has access to there. Thanks again.

[flyin ryan]

Hey guys. Well here's what a person has to deal with. As stated by diaper boy Kevin, 2.0" is standard 'Small Journal' Small Block Chev., is a good size, bearings available no problem. Next is 'Large Honda' size, 1.889", then is 'Small Honda' size, 1.85", then is I.R.L. or Mitsubishi size, 1.779". I'm having a crank done right now by Dave at Mile High Crank in Denver & before anything can happen we have to make sure it won't be too thin where the rod journal lightening hole is. The other thing a person has to watch is the oil hole, the more it gets off-set, the oil hole will want to 'Walk Over' to the crank radius, too much & it'll bleed off pressure at the bearing edge, obviously. So can a factory LT-5 crank go to the I.R.L. size of 1.779" for an approx. stroke of 3.98"? I'm not sure...never taken one that far.....yet :cool:. For the record I have used that I.R.L. size in a 900 HP+ engine & when torn down, the bearing look near perfect. Also, when off-setting that much, must make sure to Re-Nitride.

[HAWAIIZR-1]

Hey guys. Well here's what a person has to deal with. As stated by diaper boy Kevin, 2.0" is standard 'Small Journal' Small Block Chev., is a good size, bearings available no problem. Next is 'Large Honda' size, 1.889", then is 'Small Honda' size, 1.85", then is I.R.L. or Mitsubishi size, 1.779". I'm having a crank done right now by Dave at Mile High Crank in Denver & before anything can happen we have to make sure it won't be too thin where the rod journal lightening hole is. The other thing a person has to watch is the oil hole, the more it gets off-set, the oil hole will want to 'Walk Over' to the crank radius, too much & it'll bleed off pressure at the bearing edge, obviously. So can a factory LT-5 crank go to the I.R.L. size of 1.779" for an approx. stroke of 3.98"? I'm not sure...never taken one that far.....yet :cool:. For the record I have used that I.R.L. size in a 900 HP+ engine & when torn down, the bearing look near perfect. Also, when off-setting that much, must make sure to Re-Nitride.

Thanks for taking time to share the info Ryan!!!!

[jonszr1]

i second the thanx to ryan . only thing is now i want to build one .only thing is there arent any builders in ca. except nelsons and he doesnt really want to mess with a fairly stock build .

[Pete]

If shipping is a problem, getting the block here and back wont work for the 4.100/125. Unless AES or EES is selling the liners now? Last I heard they only do short block assembled. So your looking at sending 4" liners over sea's.

3.75x4.00 = 377ci

Go with Ron Woods HD liners punch it .060 over = 388ci.


I would suggest getting a complete short block done.

With AES you use stock head gasket.
EES O-rings heads/block and use cooper gaskets more $$$$

Something to think about.
Pete

[flyin ryan]

I hate Copper head gasket's & 'O'-rings. Pain in the butt, worked O.K. for sealing combustion pressure but have to silicone all the water holes in deck...even then wasn't uncommon for them to leak/seap. Used to have to deal with those in the past. I've switched everything I do over to M.L.S. (Multi-Layer-Steel), work awesome & can re-use them many time's. Some guys would tell me 'Ya, but you can re-use Copper too', I'd tell them I didn't want to use copper the first time! LOL. 99% sure nobody makes M.L.S. for LT-5's...yet.

[jonszr1]

where is aes located ????

[Pete]

I hate Copper head gasket's & 'O'-rings. Pain in the butt, worked O.K. for sealing combustion pressure but have to silicone all the water holes in deck...even then wasn't uncommon for them to leak/seap. Used to have to deal with those in the past. I've switched everything I do over to M.L.S. (Multi-Layer-Steel), work awesome & can re-use them many time's. Some guys would tell me 'Ya, but you can re-use Copper too', I'd tell them I didn't want to use copper the first time! LOL. 99% sure nobody makes M.L.S. for LT-5's...yet.


I agree.:thumbsup:
I just couldn't say it myself i would get the boot :) some of you know why.

Pete

[cuisinartvette]

Get ahold of nelsonracingengines.com

He is doign his own block/crank and soon heads so you can build a 500ci LT5.
Wont be cheap. Also can CNC his own intake to put twin screw blowers on also.

[flyin ryan]

Get ahold of nelsonracingengines.com

He is doign his own block/crank and soon heads so you can build a 500ci LT5.
Wont be cheap. Also can CNC his own intake to put twin screw blowers on also.Don't sound too subtle....:cool:.

[flyin ryan]

I agree.:thumbsup:
I just couldn't say it myself i would get the boot :) some of you know why.

PeteHuh...Got no clue :confused:

[Jeffvette]

I agree.:thumbsup:
I just couldn't say it myself i would get the boot :) some of you know why.

Pete



You can say it here.

[Polo-1]

Nelson Nelson Nelson........... 3 emails 3 voice mails never a reply. Does not want my money.

[flyin ryan]

Nelson Nelson Nelson........... 3 emails 3 voice mails never a reply. Does not want my money.Didn't want to be the first...I know three guys that dealt with him that live in SoCal, they didn't have good experiances, their stuff turned out O.K., but he's a flake to deal with. One of my piston suppliers said the same thing, in the past.

[Jeffvette]

Didn't want to be the first...I know three guys that dealt with him that live in SoCal, they didn't have good experiances, their stuff turned out O.K., but he's a flake to deal with. One of my piston suppliers said the same thing, in the past.


I've had issues in the past with him as well. Wanted parts and then disappeared.

[HAWAIIZR-1]

Thanks for all the comments and info.:handshak: I will share with the Z owner in Japan and hopefully he can find some resolution. Boy, I thought I was challenged being here in Hawaii and I can't imagine having the Z over there and also have language barriers as well as twice or three times the shipping costs that I am always complaining about. :dontknow:

[HAWAIIZR-1]

where is aes located ????

Ditto to what Brad said. What and where is AES? :icon_scra Thanks!

[flyin ryan]

Boy, I thought I was challenged being here in Hawaii Ya'...you got it tough, hey Jeff F., poor Craig...the surf, the girls,...the great weather....she's a B**ch buddy, don't know how you do it. But I'd love to fine out :mrgreen:

[Polo-1]

Ditto to what Brad said. What and where is AES? :icon_scra Thanks!

http://www.aesracing.net/lt5.htm

[flyin ryan]

Not a bad price...Lot's of work involved, no welding, factory GM head gasket, not bad. Just need a head/cams to take advantage of the added displacment, otherwise a person is wasting their time.

[HAWAIIZR-1]

http://www.aesracing.net/lt5.htm

Thanks, I passed this along too and did not know about these guys.

[HAWAIIZR-1]

Ya'...you got it tough, hey Jeff F., poor Craig...the surf, the girls,...the great weather....she's a B**ch buddy, don't know how you do it. But I'd love to fine out :mrgreen:

Ryan,

So I'm not gonna get a pity from you.........it's really tough living in paradise. Yes, I need to appreciate the awesome weather and will surely miss it when and if I move next year after retirement from the military. Please visit some day. The few times that I went to Canada I loved it and thought it was beautiful up there; you folks must have awesome places for driving. All I can do is go round and round the island........no triple digits either; get caught going over 85 and you are in handcuffs on this island.

http://i78.photobucket.com/albums/j86/hawaiizr1/vette241.jpg

http://i78.photobucket.com/albums/j86/hawaiizr1/3360b69.jpg

[flyin ryan]

Ya' well, no place is perfect I guess :neutral:

[HAWAIIZR-1]

Ya' well, no place is perfect I guess :neutral:

I forgot to also mention that we don't even have a drag strip :frown:

[flyin ryan]

I forgot to also mention that we don't even have a drag strip :frown:One in Maui is still there isn't it? Was last time I was there...NHRA sanctioned even. Only REAL Drag guy I know, personally, from the Isalnds is Roland Leong, he tells me the Drag scene is lame...overall :dontknow:.

[HAWAIIZR-1]

One in Maui is still there isn't it? Was last time I was there...NHRA sanctioned even. Only REAL Drag guy I know, personally, from the Isalnds is Roland Leong, he tells me the Drag scene is lame...overall :dontknow:.

Yes, there is one in Maui, one on Kauai and two on the Big Island of Hawaii. Oahu, the main island with over 80% of the 1.3 million population has no race track and I had hopes when we had the Super Ferry and even did a recon to ensure the ZR-1 could get up the ramps but that got shut down too due to environmental issues, etc. I think there are some folks that are still using some other ships to get to the outer islands to drag race according to the local motorsports news that I read. Roland Leong would be right and that is why he went big time in the West Coast and left the islands to become a pro when he was young. I have hopes there will be a track on Oahu again in the next few years. :cheers: