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Old 07-09-2018, 07:38 PM   #51
CRatcliff
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Called Isky and they suggested VV-71, which I know John V wasn't a huge fan of. Anybody tried IPD cams? Are they just Isky? I'm also reaching out to John Parker, on the off chance he follows through, and also reaching out to KG Trimning.
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Old 07-09-2018, 08:51 PM   #52
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I'd recommend the Z-322. Any bigger and you'll have a lumpy idle and no power in the lower rpm range with stock displacement. Raise the static compression ratio to 10.5:1 to achieve a dynamic ratio of 8.09:1.

VV-71 is very close to the stock D grind cam. It works well with stock fuel injection and stock carbs. That's why they recommend it to almost everyone.

FYI, I have good prices on Isky stuff.
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Old 07-10-2018, 12:21 AM   #53
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Ah! Awesome. You rule. I'm gonna see if I can get in touch with John V. What are your thoughts on the KG Trimning stuff? Just trying to understand what the options are.
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Old 07-10-2018, 12:43 AM   #54
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With Isky so close, I've never really looked at what other cam grinders have to offer so I really can't comment on KG Trimning's stuff although I hear it's good.

Isky will grind a custom cam as well. You're not limited to what they offer in the catalog. It just might cost a little more.
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Old 07-10-2018, 12:46 AM   #55
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Word. Sounds like a good solution to me. With that cam, any advice on the springs to go for? 98 seems a bit high for what I'm going for.
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Old 07-10-2018, 12:55 AM   #56
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Trust me, it's not.

You can cut the spring seats a little deeper into the head if you want to reduce the seat pressure but be careful, there isn't a lot of room before you hit a water jacket.
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Old 07-10-2018, 01:05 AM   #57
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Roger. I'll talk to the machinist doing the work and John V tomorrow, and if all goes well, I'll hit ya up to order.
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Old 07-11-2018, 11:36 AM   #58
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I AM still curious about the KGTrimning cams. Seems like they have a lot of really cool options. Any thoughts on if one of the guys here would compare to the Z-322? http://www.kgtrimning.org/tuning-spe...b30/camshafts/

Mostly they seem to just have a lot of good cams focused on torque and lower revs.
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Old 07-12-2018, 06:05 PM   #59
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there is a guy in the netherlands who develloped a set of cams specially for B18/20 motors. https://www.tinustuning.nl
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Old 07-13-2018, 11:02 AM   #60
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You can't say accurate timing and distributor in the same sentence without your fingers crossed.

Crank trigger it with 12 to 36 teeth, avoid lower tooth counts for accuracy and 60 teeth is too many for high RPM), and use wasted spark or COP.

COP will give you the hottest spark as the coil has lots of time to rest/recharge, COP will need a cam signal to sync the 720°.

Yoshifab sells a CAS if you won't do a crank sensor, A CAS can provide both needed signals.
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Old 07-13-2018, 11:36 AM   #61
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Quote:
Originally Posted by hiperfauto View Post
The F gasket is .039" compressed.

The B18 rods are notoriously weak. 6 bolt B20 rods are reinforced in the problem area and aren't a problem under 6500 rpm. 8 bolt B20 rods can be swapped for M rods if you don't think they're up to the task.

Ian, What readily available B20 rods are best for using in a B18?

Are the rod lower end bores the same size as B18 rods or are the B20 rod lower end bores larger?

Thanks in advance.
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Old 07-13-2018, 11:41 AM   #62
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6-bolt B20 rods are directly swappable for any B18 rods.

8-bolt B20 rods are not.
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Old 07-13-2018, 11:42 AM   #63
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Any B20 rod from a 6 bolt crank engine ('69-''73) will work. Except for the additional material added, it has the same dimensions as the B18 rod. Just make sure the rods are matched in weight as I've seen B20 rods with large variances.
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Old 07-13-2018, 01:56 PM   #64
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Quote:
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6-bolt B20 rods are directly swappable for any B18 rods.

8-bolt B20 rods are not.
Quote:
Originally Posted by hiperfauto View Post
Any B20 rod from a 6 bolt crank engine ('69-''73) will work. Except for the additional material added, it has the same dimensions as the B18 rod. Just make sure the rods are matched in weight as I've seen B20 rods with large variances.
Many thanks to both of you!

Forgot to ask earlier, are the piston pin bushings the same size?
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Old 07-13-2018, 02:03 PM   #65
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Yes.
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Old 07-16-2018, 04:30 PM   #66
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Quote:
Originally Posted by CRatcliff View Post
I AM still curious about the KGTrimning cams. Seems like they have a lot of really cool options. Any thoughts on if one of the guys here would compare to the Z-322? http://www.kgtrimning.org/tuning-spe...b30/camshafts/

Mostly they seem to just have a lot of good cams focused on torque and lower revs.
KG-17 is a nice cam that I've used many times. The Schneider Racing 284 (if you have a blank for them to grind) is also great (with all the things you've already been told) or the Tinus tuning TT6. All of these are preferred options to the VV71 in my opinion.
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Old 07-16-2018, 05:01 PM   #67
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Quote:
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KG-17 is a nice cam that I've used many times. The Schneider Racing 284 (if you have a blank for them to grind) is also great (with all the things you've already been told) or the Tinus tuning TT6. All of these are preferred options to the VV71 in my opinion.
Makes sense! I'm thinkin the Z-322 is a solid option.
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Old 07-16-2018, 06:06 PM   #68
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Quote:
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Makes sense! I'm thinkin the Z-322 is a solid option.
You gonna come pick up some B21/B23 rods? Lemme know.
I must have piles I'm stumbling over. I can set some aside.
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Old 07-16-2018, 07:24 PM   #69
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You gonna come pick up some B21/B23 rods? Lemme know.
I must have piles I'm stumbling over. I can set some aside.
I am definitely interested! Ian was also mentioning using Chevy lifters with tubular pushrods - first step will be getting the cam in hand, I think, then going from there.
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Old 08-06-2018, 04:54 PM   #70
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Hey John, I'm gonna go with the Nissan L28 valves as recommended (from 1976), and am going with the Isky springs. The machinist I'm working with (Brad), asked me to reach out and ask if the angle from the retainer to the locks from the Isky springs (3 groove) will work with the Nissan valves.
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Old 08-07-2018, 03:06 AM   #71
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Quote:
Originally Posted by CRatcliff View Post
Hey John, I'm gonna go with the Nissan L28 valves as recommended (from 1976), and am going with the Isky springs. The machinist I'm working with (Brad), asked me to reach out and ask if the angle from the retainer to the locks from the Isky springs (3 groove) will work with the Nissan valves.
Almost certainly not..Those valve I was spossed to be getting should be shipping like NOW--8 hours ahead..
Been more than 30 yers since i fawk with L seris stuff but memory says they were single half round groove--which IS my favorite,* ..But L series has kinda small exhaust valves doesn't it?
Whatever the case, the valve locks again almost certainly have a different angle..The japanese always do splines and angles and junk different just to annoy you.

A cam is coming, by the way..

(i've been living the whole day IN the garage cleaning like a fool for over a week..So if you want updates, come by and visit...I'll let ya know when things are shipped.

* Ha! checked and yep half-round and intake is only 44mm so no bigger


and exhaust is a measly 35mm


As I thunk..
What's the point of that? That's small.
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Old 08-07-2018, 06:14 PM   #72
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Hrmm, crazy. He snagged some 38mm exhaust. What are your thoughts on making that work with the stock retainers? Or will I need to go with some different springs to make that match as well?
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Old 08-07-2018, 06:18 PM   #73
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Quote:
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Hrmm, crazy. He snagged some 38mm exhaust. What are your thoughts on making that work with the stock retainers? Or will I need to go with some different springs to make that match as well?
canät say wifout seeeing the stuff..can ya bring valves and lock-split collets over?
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Old 08-07-2018, 07:00 PM   #74
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I'll try for sure, but I'm out of town every weekend, until September, and then gone from September - October
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Old 08-07-2018, 07:25 PM   #75
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I think the guys at AutoSport should be able to figure it out, and honestly I'm hoping the whole thing will be done within the next couple weeks! Isky cam is all ready to go and I have all the parts except for a correct mating of valves to springs. :D So excited!
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