62mm TB and what I am "Feeling"

[lens_xj]

This is a review of a 62mm TB that I but on about a month ago.
As much as I can, I research everything I put in and on my jeep. I read so much sometimes I get confused, I read anything everything I can about the upgrade I am wanting to but on, from the hot shots that spout off a lot of numbers with flow rate and such’ to the ones that are like me (I know and understand what I feel, I don’t understand the numbers that well). I have read blogs where someone said this or that upgrade was the best thing they ever put on there jeep, they love it on and on . But, nothing about what they have or may not have in upgrades that may affect the one they just put on. I can never understand with what they have done and compared this to what I am doing or what I want to do. So, this is my attempt at giving information to all those that are at the same level I am and others who might find value in my observation.

Let me start with what I have done so far . on one side of the 62mm TB are Headers “torque tubes”, 2 ½” exhaust pipes , hi flow cat, and muffler. on the other end I have a K&N hi flow air breather, 24 # EV6 injectors.
Not really that much but Now that you understand what upgrades I have let’s talk about the one upgrade I just put on and what that is or is not doing for me. no numbers just a set of the pants feel.
Everything feels a little better all the way around. It starts better, Ideals smother, polls just a little bit stronger all the way though the power band. There is a small hill in my town that whenever I drive on it and leave the throttle even, the jeep slowed down. But now with this TB and keeping the throttle even, it does not slow down at all. It is just a little bit better everywhere. I do not think if you had a stone stock engine The TB would not make any difference that even I could tell. I think it is everything before the TB and after that made a difference with this upgrade. Not a big one It feels like you had a really, really, I mean really dirty filter , after you clean it up and you will fill a difference. This would be about the same thing.

Now for the next upgrade. 1.7 Roller rocker arms. I don’t expect big gains but again I fell if I did not have any of these upgrades that I have talked about before I would see less of a gain. Everything effects everything else, I really fill just doing the rockers would be a waste. I will let you know how that upgrade “feels” once I have them installed and put some miles on them.
O yes. I was talking to a buddy of mine and telling him about the none adjustable roller rocker arms I am going to get. He knows what my plans are with this jeep and he told me that I should be getting adjustable Rockers. The reason (and it make since) is if I was not going to make any other changes to the engine I would be fine with the none adjustable rockers but,, I am, so things will change. depending on the cam and I end up end I stay with the none adjustable rockers the length of my push rods may have to be changed. Adjusting the rockers would be far less expensive than doing a custom grind to get the length right on the pouch rods. Anyone have a thought on that?

[amceaglesx4]

Pretty sure adjustable rockers are more than a custom camshaft. I believe my tb was bored to a 70mm which id great but I have a stock non ported head on my 99 so there is really well technically less performance and uses more gas than stock. For a beefed up 4.0 or stroker it would be beneficial. Smaller bores means air enters faster which atomizes fuel better and more efficient. You need bigger ports and head to take advantage of more airflow.

[SilverXJ]

Adjustable rockers do not mean you can use any old pushrod. You still need the correct length pushrod to work with the rockers. You want to dial the adjusted down as little as possible.

[lens_xj]

a good set of rockers are more expensive then just a cam but I do not want to do that much work now, and it is to long of a down time.then again I would never just get the cam any how. so if you ad in the timing chain , gears and, and , and the cost would be about the same with the rockers costing maybe a $100.00 more.
this is what I really do not understand. why use adjustable. I know they are more expensive but what advantage do they have over none-adjustable rockers

[Russ Pottenger]

If the valve stem tip Heights are set up correctly it's not necessary to run an adjustable rocker arm.

If you're going to run the 867 hydraulic flat tappet lifter
that runs a .002 to .004 preload or a 801 solid flat tappet lifter that will require a measured valve lash, you'll need an adjustable valve train. Otherwise in my opinion it's not worth the extra $200.00 the run adjustable roller over the nonadjustable. As most know you'll need a valve cover spacer, thermostat spacer, and a additional valve cover gasket.

I do agree with you that sometimes there's good reasons for increasing the rocker ratio from a stock 1.6 to a 1.65 or a 1.7

I sell the Harland Sharp nonadjustable rollers in any ratio for $375.00
The adjustable rollers are a additional $50.00 and sell for $425.00


Russ
Bishop-Buehl Racing Engines
(626) 673-2203
Email/PayPal: [email protected]

[rainman]

The best bang for buck in raw hp output mod I have made on my xj is getting rid of the mechanical fan installing an electric (Taurus) fan.

Have you read the FAQ on roller rockers in the FAQ section? After thinking about it I decided to go stock. As I was happy to leave a bit of power on the table to ensure reliability, and spend the money else where.
Good luck with it.